I think it summarizes well the thing, although the clamp yours, I use this system for over a year almost to the day, the cup fell once during hot / cold shock, really impressed.
A little regret perhaps, I use an iphone 5s, the holding is excellent, no problem, for reading, radio / music, gps. But during handling, it becomes impossible, imagine, hand you hold your phone in the middle with two fingers, and the other for the button on the iphone, it's impossible, the phone accompanied by support. But if you do not touch your phone all the 5sec, it is a support of an excellent workmanship, a counselor!