I've had the Wolf Evolution for about 2 years. My car is parked in a carport. Most of the time, uncovered. But if we expect a couple of days of rain or hurrincane nearby, I cover it so I won't have to deal with waterspots.
So, it's been off and on qiute a few times, dries fast and I can't see where it scratches the paint.
I'd buy another one if I needed to.