I bought both of mine thru Bavauto. I have the Noah (e30) and the Evolution 4 (for my wagon) Like both of them, both easy to put on and off. The Noah is a little heavier duty but both are easy to put on and off. My 1st Evo 4 had worn through in a few spots after a few years on my wagon, but I think that was because I covered it with the roof rack on so it was more stressed than it would have been normally my second is actually an e39 version and works great with my roof rack on.
Be aware though in this area and with dark cars the covers will do a great job of keeping off most dirt, but over time they absorb micro dust so when it rains the dust washes through the cover and sits on the car, not a big deal, but you will need to dust the car when taking the cover off. I assume that is the trade off with a breathable car cover, over time it does collect micro dust, but if you are in a covered area the rain issue may not be as big a deal