I have an Adco cover - I have had no issues with it.
This is the 4th winter I have had this cover - on a 32' Fifth Wheel. I was thinking when I put it on last fall it would be the last winter. But as winter is coming to an end I was looking at it and I see no reason it won't go another year. It has a small tear on the side, that I created when installing it 2 winters ago. Putting it on myself I pulled when it was caught on the awning, small tear. It has a couple thin spots on the corners of the bottom edges, but no real tear. When I put it on next winter I will just make sure those spots don't line up with the same corners. The key is making sure the straps are tight and it doesn't move much when the wind blows. We get plenty of wind and I have no issues from the cover wearing the paint or edges or anything.
All in all I would say money well spent, it really saves the roof and surface of the trailer. I clean and wax before I cover it and when I take it off it looks like I just cleaned it. Ready to go.