AWFUL. don’t waste your money. the magnet is very strong but the CD drive mount gets loose and doesn’t stay in after a few minutes of driving.
I’ve had opposite experience compared to other poster. I bought 2 last time these were listed and put one in my car and the wife’s. Both have stayed sturdy for weeks. The plastic made a cracking sound when I tightened and I thought I broke it. Took it back out and it seemed like when the wedge piece was moving it had to pop open. It felt like I had tightened enough before the pop, then it moved more after. I have an S5, wife has larger Motorola and it holds both well.