That SeaSucker worked extremely well. I had no issues with it at all. I drove an hour and a half with a steel framed hartdail 29er on there in a torrential downpour at 80mph with no issues. It didn't budge. It was nerve wracking to use it the first few times though. After I got used to it, there were no worries. Each of the vacuum cups holds something like 200 lbs of pressure or something crazy. Even if there was a cup failure, the other 3 would hold it quite well. It is a nice option for those of us with vehicles that are not hitch/rack friendly, such as my Mustang.