Let me put it this way. That exact vehicle/cover you see in those pictures stayed in that very same spot all through Hurricane Katrina. When I returned, the cover was still on it, and there wasn't a scratch on the car to be found anywhere. The outside of the cover looked like.......well......like it had been through a hurricane, lol, but a good cleaning and it was good as new.
The Weathershield HD is by far the most durable cover I have come in contact with. If your car stays outside in the elements, I highly recommend it.
I actually have the one we bought for my mother's 04' BMW 330cic for sale, if you know anyone interested. It won't fit your Rover, but I thought you might know someone with a 3 series BMW.