I've been using Van's canopy cover for my -8 for 15 years. I like it because it's light as a feather, sheds rain, doesn't take up much space. I only use it a couple of times a year and it has held up well.
I had a light weight cover from Flightline that lasted many years. It worked great and I was very happy with it.
Last year, I noticed that the cover was leaving some residue marks on the paint. They cleaned off easily but I decided to get a new cover. It lasted over 8 years of occasional use.
I bought a new cover from Bruce's that I will use for the first time next week at Osh. It's a bit heavier than the one from Flightline.
I have the lightweight travel cover from Flightline. It is difficult to get it on the airplane if there is ANY wind. It is just too lightweight. Once it is on, all is good, so if you have a friend help, it works fine.