From about December to Feb/Mar mine's permanently on. When it's not on, it's folded up and in a bag on the back seat, just in case I get some heavy rain when I'm out and about. Unfortunately, with a 4 seat, there is now way of folding without creasing the plastic windows. I've had her 4 years and have had no issues, and I think the hood is about 10 years old. It's in Everflex.
The tonneau cover is usually on from Mar to Dec, but currently is folded up and stored behind the sofa.......