I got the black cheap case today. After reading the reviews I knew better than to just throw it on there. So I took a small metal file that I have, and proceeded to shave each clip down just a little. After a few trials I got the clips shaved down enough that they all fit and are not pressing against the bottom of the screen hard enough to scratch it.
The coating on this case was not really rubber. Its more of a dusted flat black. It's not slick to the touch, but it doesnt grip like the rubber of the phone.
The phone still fits into the generic style T-mobile mount. But its not as secure as without. I can turn it upside down and give it a light shake without coming loose. So hopefully it will be fine.