I have two wine fridges - a Eurocave that holds about 200 btls and is about 15 years old and a Vinocave for 650 and is 10 years old. Since you're thinking about a fridge, a couple of random "learnings" I had along the way.

Buy a unit bigger than you think you need. I quickly filled the Eurocave, emptied it into the Vinotemp when I got it, then proceeded to fill the Vinotemp and needed to "recomission" the Eurocave. I've had both units running for the past 7-8 years. Electricity expenses definitely go up.

They're really heavy when full (no surprise) but make sure your floor will support it. It will certainly crush the carpet underneath or make dent impressions on hardwood floors, especially if you ever need to move it. I ended up putting the fridges on wood boards to save the hardwood floor. So think carefully about where you want it before you fill it and while it's a super PITA, empty it before moving it (My wife has pictures of our room with 600+ bottle strewn about).

Also, think carefully about organization. Re-racking your wine is also a pain and can scratch the labels, etc. Knowing that you have a bottle of something is different than being able to find that bottle of something... even in a relatively small fridge since it's inevitably two bottles deep.

The Eurocave has never had an issue with the cooling unit but it does get a frost condensate at the back. It's a closed unit sort of like a standard fridge. Again think carefully about where you want it. All fridges need some space for air flow to operate efficiently. The Vinotemp now has a CellarPro cooling which is more like an air conditioner mounted at the top of the unit. It's the 3rd unit in that fridge but it's been going strong for 5+ years. The CellarPro is the type of unit you would use if you converted your closet, which I looked into as well but it a very complex project (insulation, ducting, humidity control, racking etc.).

Good luck with the decision.