The lack of enough effectively warm the water by several degrees or longer on hotter days extra direct is a cornerstone.
Chemically cleaning the filter about every two months lengthens the life of the filter media and promotes longer filter runs. An additional 3 feet in the sides is great enough.

These offer some huge advantages that will possibly not even realize.
They are a good idea the money and will last you in a great many. High-end covers: Spending a bit more money will buy just cover along with a longer useful life.