Working with Wayfair on this purchase was a terrific experience. The first unit arrived but was defective and a second unit arrived with no fuss. Unit is quiet and nicely made.  

Given the volume of the cabinet loaded with 60+ bottles, I decided to insert 2 commercial Rubbermaid refrigerator thermometers (upper and lower) to determine the overall unit thermostatic accuracy. For my unit, here is a 5pt variance between the thermostat setting and the reading of the two thermometers.  While disappointing hence 4 stars, adding the commercial thermometers allows a confidence that my wine will be stored properly regardless of the variance.
  
The racks are fixed and designed for standard bottles.  When I needed to store oversized bottles, I found that a phillips screwdriver will unlock the back tray tabs so a rack can be removed creating additional height for oversized bottles.