I've had the Thelma two bike for years and decided to upgrade to the Super Clamp 4 bike to accomadate our growing bike collection. This is the most thought out bike carrier. Pros... Carries 4 bikes very securely, easy to use except for the one rack closest to the vehicle. Really like the cable locks to keep bike secure on rack along with the hitch lock. Cons.... I have a really hard time loading bikes on the rack closest to the van and scratched my van in the processes. Also, make sure you push the cable locks in until you hear them click otherwise they are not locked. It's also very heavy so I'm leaving it on for the season and will need help getting it off and into storage. All in all, I would buy again! Heavy duty, well made and should last me a long while!