Fourth season on mine and it seems to fit better every year. Went with Cadet grey as I figured it wouldn't transfer color and would be cooler. It's not clear what material everyone went with but I did Sunbrella and the Gortex thread. I wanted to buy this cover once and be done with it for the life of the boat if possible.
For maintenance we go to the local laundry mat that has commercial machines and wash them then apply the 303 water proofing to them every other year. Probably over kill but it seems to have worked well on this and my last cover I bought from them. My last cover was 8 years old when I sold the boat and was still in very good condition. My boats are stored in indoor heated storage in the winter and sit on an uncovered Shorestation in the summer. I've had a lot of covers over the years and these have been about the best I've had.