I'm the second owner of a full size Vector Uzi SMG since 2006. The Uzi was made from one of the last of the Group Industries receivers as one of the last SMGs made by Vector (early May,'86). Many trouble free thousands of rounds of 9mm. I have shot .45 ACP and .22LR with the conversions, but a lot lower round count. The .22LR conversion took a bit of tweaking to get reliable that is all detailed in the pinned "Trouble shooting" guide.
In 2017 I bought a semi auto Vector Mini Uzi (as it turns out it, too, is one of the last made by Vector), and it has always shot well.
That said, for semi or properly converted full auto, I'd buy an IMI gun at the right price over a Vector, just for the panache.
Best of luck with whatever you get.
MHO, YMMV, etc. Be well.