The covers work great, and last well beyond my expectations. I have been using 3 for the past 5+ years, and am still using them. One is about to be replaced , however the other 2 are going to keep going for a few more years.
They are easy to install and remove with the help of a short rounded stick, or in my case, 1/2" pvc with an end cap. The process helps keep the metal stays from flexing in windy conditions.