The first impressions of the iPhone in the holder you have to remember that it all fits so well. It looks tight, but tight is a very elastic term. With enough courage suddenly fits well and makes the next pressing no more problems. It is safe and low vibration in the holder. Here, all the buttons are still easily accessible and are not therefore covered.
But the weak point: the audio input. He is free, but the with very little space. I think not plug the world should fit between the clamp and side mounting in the entrance. I'll probably get cut a piece and then soft melting. For me, unfortunately, one of the main arguments in support, as I see no sense without audio connector to push my iPhone in a holder and to hang the window. As convertible drivers I use is the speaker of the iPhone is not much, because the ambient sounds are much too high. When Navi it would be much too quiet, while listening to music it would sound shit.
However, those who have followed his iPhone via USB to your car radio, etc. no problem.
In short, strong, stable, well-made se holder to which one can use everything but the audio input (make alterations without itself).