If a poly LCA bushing "falls out" of the socket, it was an installation problem (a really bad one at that). If the LCA slides back and forth on the LCA pin with a poly LCA bushing, it's an installation problem. Period. I've run poly LCA bushings for tens of thousands of miles on multiple cars, if installed properly they work great. I always use them with greaseable LCA pins and adjustable strut rods, and I have never had an issue with them.