The first one I bought from Flying J, I don't remember the brand, it had a bluish packaging. I bought it because it was the most tunable and it worked great until I hit the dirt, the mast fell right off. Upon inspection, the mast base wasn't tapped all the way to the edge so only one thread was holding it on to the mag base. I spent some time at camp filing down the mast base so more threads would contact. After getting three good turns I feld good about the mount, the next day, the mast fell out of the newly secured base.
The next 2 were Scosche, one got destroyed when it flew off the roof and the other it useless since the antenna base became separated from the magnet which remained on the roof. The Scosche wasn't a tuneable application. Being expo is hard on gear. I still need to get the real deal mounted in my Runner, maybe I'll order a fender mount this week.