Hmm...not bad, I guess. It looks like it just attaches with elastic bands to the door hinges and the rear tail-lights ( I guess that's why they say it won't work with flush mount lights).
It does look like it would wad up pretty good and fit behind the back seat. I wonder how small it would get. Maybe stuff it in the center console?
Yeah, I'd be curious at what speed you can get to before it flies off.