I needed a car holder for my new HTC HD2, which is a sizeable bit of kit.
There's a million of them here on Amazon and I can't recall exactly why I chose this particular model. But having received it and tried it out I am well pleased that I did. The double jointed arm is very sturdy and very positive in adjustment, much more satisfactory than one of the bendy-neck variety. The 'sucker' is substantial and the vacuum lever really seems to weld the device to the screen. With ProPilot on the HD2 you have a truly excellent in-car sat nav.
Downside? Just the one. The holder at the side can contact the bottom of the volume control on the side of the HD2, meaning that you can reduce the volume, even to mute, as you slide the phone into the holder unless done with care. But this is a small niggle only.