Tom, I bought one from Costco once upon a time to replace a trash compactor, a Vinotemp. It had one temp zone. I now have a larger model with two zones, Kitchen Aid brand.
From what I recall of my investigations, U-Line and Marvel are the top brands. I'm happy with the Kitchen Aid, which I purchased for about $500-600 less than either of the aforementioned brands would have cost. It's an under-counter model about the size of dishwasher. It's supposed to hold around 60-70 bottles. Love having the two zones so that whites and reds come out at appropriate temperatures. Only problem with that has been training Darling Hubby to understand
which zone's which, and stash wine accordingly.
It sounds like you're planning on the smaller, trash compactor size. There, the only advice I can give you is to pay close attention to the shelving. Where our Kitchen Aid has drawer-like pull-out shelves, the Vinotemp had lateral metal bars, and not very many of them leaving large gaps which required you to place the wine perfectly or else bottles, especially burgundy shapes, would get off-balance and fall through, crashing into the bottles below. It was like they designed it for Bordeaux shapes only, actually. Never broke a bottle but since the storage capacity is based on two-bottle deep storage, it made scooting around to get the rear bottles kind of dicey.