Product review (5 stars): Install was easy, but there are a couple of tricks.
I am very pleased with the overall design of this unit and it functions just as described.  I found it easy to install with the following notes.
1. The square flange was somewhat bigger footprint than the previous cover and I needed to cut back some surrounding trim for it to fit flush.
2. The unit needs to be painted to protect it from UV light.  I roughed up the surface with 200 grit paper and sprayed it unassembled.
3. After drying I attached it to my house.  The supplied screws have fairly small heads and I decided to back them with some washers to avoid cracking the plastic.
4. I used a small bubble level to assure it was plumb so the mechanism would move smoothly up and down.
5. The mechanism rattles slightly during use, but not enough to be heard in the house.
6. It looks easy to pop the top and clean this unit to assure it continues to operate as designed.

One month follow-up. We have had sub-zero weather of late. Inside of drum is near room temperature when not in use. Very satisfied.