Here is the Ultimate Collector Series Millenium Falcon. I got it when it first came out, and it's the Largest Ultimate Collecter Series Lego set to date, at over 5,000 pieces in the set. This was one interesting and time consuming Lego set to build. At the time of this writing, it is also the most valuable ( in terms of what prices people are asking for it now. ) Ultimate Collector Series set also.
The thing that I like best about this set is how it was designed, construction wise. This is one of the biggest Star Wars vehicle replicas that Lego has ever made, and oddly enough, even at this size, it is one of the most stable Lego sets I have ever put together, which is unusual for the really big Lego sets. It is even more stable than most of my smaller UCS sets.
My theory is that Lego must have had some real knowledgable construction worker help design this particular set. If that's the case, Lego should have this person design all the UCS sets. Even pay him or her more money than they probably do, and just take it out of their CEO's salary. ;D.
This thing is really well made. It has beams, braces, studs and even red pieces that are used as rivets. Unlike a lot of other Lego sets, this one is really made to stay together after it is built.
I can just take the top turret off ( and it just slides off, it's not snapped on so it's no trouble at all ), and then grab the framework right under the turret, and carry this big thing with one hand without worrying about any part of it coming apart. I would not want to carry it for too long though, since it is rather heavy. =D