Wilhelm,
We got one earlier this year for a 2,500 mile round trip from Scotland to France, and it was great. We had 1 day of torrential rain and it kept everything dry. As Gerry said, it's well made, it's also quick and easy to attach which minimised the time taken to re-pack the car.
The one comment I would have is that it doesn't have a solid floor so we needed put a piece of cardboard in the bottom of the bag otherwise it sagged through the bars of the luggage rack.
