3 stars because it has "The good, the bad and the unknown:"
I've never provided a review on wayfair before so I think three stars is appropriate and if I can go back and edit I will.
The Unknown: I just purchased this and set it up in the summer, so I don't know if the heat works. More to follow.
The good: We have an approximately 350 sq. ft studio we are using this appliance for. When I set it up, it cooled the area down quickly. 
The bad: I was able to set this up fairly quickly and the instructions were pretty straight forward; however, as you can see from the pictures, the window sleeve is not designed very well. My window is 32.5" wide. The sleeve leaves a pretty large gap with the window. I had to add a significant amount of weather stripping to it so I could seal most of the leaks. 
If I can edit this review or update it later I will based on the performance of the unit.