I bought an expensive retractable tonneau cover on my truck 3 years ago and only realized after install how much space it took up near the cab. Since my reason for getting the cover was to stow valuable tools and luggage when away from home, this reduced what I could pack by a decent margin. I ended up grabbing the MX4 because it had a lot of the same features, namely that it was hard and locking, but took up no bed space. Installed it last night then left my truck in the driveway where it was doused in rain for hours. Whereas my old cover would keep most moisture out, there would small wet spots in the corners, but my bed was perfectly dry this morning. I couldn't be happier!