I’m on my second prestige half cover and it’s superb. The first one lasted 8 years before it started to disintegrate inside and therefore leak. It discoloured from black to grey in around 3 months though, presumably from the effects of UV. The new (ish, got it second hand from another member!) one was black and is now turning grey, but still 100% waterproof. I’ve just bought an “Ultimate outdoor car cover” from classic additions for £195 so I’ll report back on how effective it is when it turns up.
Cheers!
Russ