I know a few guys that swear against them after having dented frames from hanging the bike over a tailgate with a pad and shuttling a rough road.
I've ran one for probably 5 or 6 years now. It just lives on my truck. Things to note:
1. Strap the bikes down or you'll dent the frame or have your bikes fighting each other on the drive up.
2. Scuffs the hell out of your tail gate. When I pulled it off my last truck I realized the clear coat on the tail gate was all scuffed up. A power polish would fix it. Solution for the new truck was to 3M the whole tail gate.
3. It tells thieves you have bikes. I'd avoid keeping it on if you have them stored in the garage.
4. I have no idea why I'm making such a list about this. It must be time for bed
Honestly if I could justify getting a north shore rack I would, but I don't have a hitch on my truck so the price goes up.