I bought a Vector this last spring, and despite having a few other PCC's (Coharie CA89, MK760, Kahr 1927A1), the Vector seems to be the one I've been taking to the range most ever since. I think this is more because it's "new", it runs, and runs, and runs, and mags are stupid cheap then any inherent superiority to the others. The MP5 clone has the best ergos and accuracy, the MK760 is the lightest and most Omegamanish, the Kahr is the heaviest and most expensive to feed, but the Uzi, well, it goes "pew pew pew" all day long. I used to have an IMI Model A, and the Vector is a nice alternative considering the price difference these days. Waiting for Washington state to get it's new SBR law Form 1 friendly and the whole gang are going SBR.
One other neat thing about the UZI, parts are CHEAP. I bought a spare top cover and put a rail on it for a Vortex SPARC I had lying around, and that easy mod was enough to really bring the UZI into the 21st Century.