I still own a ATT Nokia Lumia 635 and i still use the Matte Black shell but I find it too slippery for my taste so I was wondering are the Glossy color shells slippery when it comes to gripping it with your hands?
If you are looking for the 635, I listed my unlocked ATT version in the Marketplace along with the case (new) and a screen protector.Please do. I went through three cases before I found one that wasn't even more slippery than the phone itself. Turns out the Terrapin case is very grippy but it's really hard to press the buttons on the side. Maybe it would have gotten better over time, who knows. I've only used the case for about a week or two, then decided the hassle isn't worth it and went back to the orange shell with no cover at all.
I've since replaced the 635 with an 830 that I'm not too happy with. Might return to the 635 some day if Microsoft doesn't fix the apparent issues with the 830 (auto reboot, lost wifi).