I've heard that complaint, but I like that bottles are held firmly and never had trouble getting things in or out. My issue with the Tacx is that you have to stick the bottles in pretty straight so reinserting in large bottles from the side is a pain, particularly when you're hammering. With the rib cage, you feel a satisfying click when the bottle is all the way in. Plus, the rib cage is aesthetically more pleasing.

I've tried quite a few bottle cages, and the rib cage is by far my favorite. Having said that, I've heard many people don't like them. People seem react one way or the other to them.