This is the second holder I have purchased of the same model. Holds my iPhone 3 GS firmly in place. I have only mounted it to my dash and it works great allowing me to precisely angle and to some extent position the phone. You can also mount the phone horizontally.
The adhesive failed in really hot weather in one of my cars. I suspect this was cause my mounting surface was rounded so all the adhesive could not make contact to the dash. I epoxyed the smooth surface for the suction cup to my dash to avoid this problem.
Otherwise I'm very happy with this product.
One more thing I should note. Turn off shake to shuffle on your Iphone if you mount your phone to your dash. You'll be a lot less frustrated when you drive down a bumpy road with your phone hooked up to your stereo.
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