Mine works Ok other than as already pointed out - it blocks the vent.

I noticed in the winter that the smartphone got very warm from the hot air, but I don't think it got hot enough to cause any damage.

My problem is that the PPC 6700 is virtually useless during a sunny day as I cannot read the screen. I made a hood out of cardboard to block the sun for mine but that doesn't really do the job.

So my solution is to use my Treo 650 which has a much brighter screen.