I had one of the Sprint ones and was not too impressed... I found that the foam mounts would slide around a bit when the glue got warm... I drive an 18 wheeler and there's a lot of vibration so I have had to do quite a bit of testing on different mounts. I know it's expensive but Sprint and best Buy now carry a mount made by Griffin Technologies, I think they are actually made my HTC, specifically for the EVO. They're $60 but very cool. You plug your charger into the base of it and such... I have been using it for a few weeks now and I love it.
http://mobile.engadget.com/2010/08/2...sprint-stores/
They don't have it on the Sprint website yet but they do have them in the stores.
Good luck
Edit: donatom3 1 month ago
in reply to Jeffrey Tschiltsch
The SD card unmountable thing is actually not written out completely. The phone still sees the SD card you just can't set it up in mass storage mode, so if you have a stereo that can mount any usb mass storage it won't work with this dock. You will be able to listen to music through the evo through bluetooth a2dp or through the 3.5mm headset jack.