I also found this set at a garage sale for about $15. I give the set only 4 stars for Value for the money because it retailed for close to $200, and that is very steep for any Lego set, no matter how awesome. Having said that, I was very pleased by this monorail. It has a phenomenal color scheme, I just love that they gave it black base plates, dark black and grey pieces, with the trans blue windows and neon accents. Kudos to the lego designer who made that decision. Probably the only thing better than a Unitron monorail could have been a Spyrius monorail, but they never produced that set.

The monorail is relatively easy to set up and build, and also very fun to play with.

Overall, a very nice lego set, but I would advise against paying top dollar for it. Try to find this one at a discount and you will be most happy.

I found this set while garage-sailing around the neighborhood, and got the entire thing for $5. Yeah, it's amazing (the deal and the set)

Box/Instructions

THE BOX IS HUUUGE! It has alot of nice pictures of the set from different angles and some other ways to build the set. The front of the box flips up to reveal more pictures, and some transparent wrapping exposes the pieces, nicely sorted in a plastic tray. The instructions are very clear and easy to read, also in the back are several different ways to arrange the tracks, which is very helpful and adds on to the playability and customization levels.

Parts

There are many unique and different parts here that reflect the immanse creativity and quality of LEGO during the mid-90's. Lots of trans-blue elements, a lot of trans-green, and big supports for the tracks. The tracks themselves are nicely sized parts and fit together nicely. There isn't much of a variety in colors, though. But it does have a nice 'spacy' feel. There is also a nice elevated baseplate. I'd also like to add that there are a handful of stickers, but they are actually ok, and show very minor signs of losing their stickiness after almost 16 years (WOW).

Minifigures

I got the set used from a garage sale, and it had all the minifigures but one, which was replaced by a classic pirate, and a Space Police (1995) minifigure as an added bonus. They have great detail (all of them really) and fit in with the set/theme nicely (except for the pirate guy)

The build

The build took me about an hour and a half, and I'm a very fast builder. Some of the parts were missing from mine (again a garage sale issue) so it took me a while to sort through my own collection for replacements. The build is fun, challenging, and engaging; I couldn't stop building!

The completed model

This thing is HUUGE, so build it near where you want it, because there's no lifting it. Just to give you an idea, the completed model takes up an entire table in my basement, which is a decent sized table that could seat up to 8 (real, not LEGO) people.

Summary

If you have the chance to get this set, GET THIS SET! It is probably the best set of the 90's, and possibly one of the best sets ever. I've built this set 3 times, once before I moved, then in my bedroom (VERY BAD IDEA), and just today I rebuilt it in my basement as part of a base system for one of my full scale LEGO wars. It truly is an amazing set. If you can get it, get it. And enjoy. :)

For starters, I tried to find any possible flaw with the set's track and functions. The monorail track individually is flawless, the track itself is perfect. So to save time I'll split the review so you can decide what's worth reading.

Track system: Exactly the same as the futuron, airport and accessory track. No surprises there. BUT the track system as is is perfect. It consists of 9 basic pieces. I'll list them for you:
-Short Straight: 8 studs long
-Long Straight: 32 studs long
-Up ramp: 32 studs long, inclines track, required to level decline
-Down ramp: 32 studs long, declines track, required to level decline.
-Direction Switch: 16 studs long; stops, reverses, or continues motion with knob
-Large curve: 28x28 (?) curves track 90 degrees
-Track switcher left: Curves a track 45 degrees or stays straight
-Small curve left: completes a switcher (above)
-Track switcher right: Curves a track 45 degrees or stays straight
-Small curve right: completes a switcher (above)

The directional switch has an arrow conveniently pointing where the monorail will go. Also the switcher has a fail safe that resets the track should the train encounter a dead end.

Layout:

The overall layout of the track is somewhat simple, but uses what it has seamlessly. The layout is an oval design with two switches, each curving to the inside, one path curving up and the other curves down.

On the side is one base, a landing pad with a rotating elevator for the pilots. Here, you can change the direction, and the radar will rotate as the train passes. This is built on a ramp style baseplate and has a few radars and scanners.

On the downward slope is a dead end where the train must either automatically stop or reverse. When it does, the front cockpit will slide onto the included transport truck if it is in place.

On the top, the train will stop and release the back cockpit onto the pad above, please note this will reverse the engine. Underneath this is a small watchtower with a folding wall on the back. There are also two control panels inside. Behind this is a small radar.

Train and vehicles:

The train is a standard two sided model with the motor in the middle, and a battery box on one end. Unlike the futuron version, this one has no tool storage or tools for that matter. I'd also like a place to store the android other than seating him in a cockpit. Each cockpit is removable and lifts right off, it isn't even secured by any studs, so if you flip it upside-down, they will fall off. This isn't an issue since that is impossible, and this feature allows the cockpits, which double as unitron spaceships, to lift off onto the transport truck or the landing pad atop the watchtower.

The transport truck is perfectly sized for carrying one of the cockpits, and even has latches to hold it in place. Plus, the front is also a detachable hovership. The only thing I could want would be a small buggy for the ramp.

BONUS - the cockpit system will work with ANY of the unitron cockpits (1787, 1789, 1793). I've personally tested it, and I'd like to note the cockpit from 1787, the crater cruiser will not work unless the booster is removed.

Value: Overall, your getting a low part count, but a heavily modifiable track. This track system can be used with ANYTHING (even aquazone, I've seen it personally), so feel free to MoC your pants off. All in all, your getting a gigantic track system for a decent price. For the uses you'll get out of it, especially if your a train fan, space fan, or an MoC creator of either or both.
The best you'll get for this set now is about $200 US, so it is up to you...

Pros:
-Huge track
-Wonderful special features
-rotating radar
-Interchangeable cockpits
-Four figures
-Modifiable
-Three base plates
-Good motor
-Rotating elevator for pilots
-Cockpit release system
-Easy to control

Cons:
-Pricey
-Not as detailed as it could be
-No accessories
-Could use a little more... anything

Other than that, I'd recommend this to anyone, so long as you're fine paying the whopping price tag on it. Now, this much money will get you a remote controlled Emerald Night, but Emerald Night cant go uphill, doesn't have a station and won't turn into a spaceship. It's your choice...

I give it an 8.5/10, but I'll give it 5 stars since I'm a space fanatic.

Wow I can't believe I finally have this set. I bought it off bricklink about 2 weeks ago. Sealed, box in excellent condition. The colors of the windows fit perfectly with the other 3 unitron sets. Space Station Zenon fits very nicely next door along with Crater Cruiser to go out and explore new terrain while Star Hawk 2 explores the space above. Sorry imagination got carried away. The most creative monorail track (other than the regular trains). The Futuron rail is great as well but just like the old aiport monorail, its just an oval. This layout consists of three levels, an internal oval on the second level and stopping points on the first and upper levels. The flashing lights make another awesome space feature. All in all, the set is just AMAZING. Why has this not become a legend yet

this is the seconed best monorail in my opinion(6399,6991,6990)This set has a cool land vehicle and the best bases of all the monorails. And a huge box. There are black baseplates and lots of buildiing possobilities. There is one bad thing, though. Only 1 long strait rail. O well, nothing bricklink and some extra cash couldnt fix. Its very much worth the money and can also get it pretty cheap on ebay.