I absolutely love the case. I got it for both of the phones I bought. I scuffed up all of my previous WM phones and felt this case was worth the investment. The one with the grey grip looked shoddy, though. The sliding is not affected by the case at all, and all of the buttons are easily accessible.
I fully feel more confident that these phones will last a long time because I decided to protect them with a case that is fit for them. I also immediately put on a screen protector (generic one, used X-Acto to cut to size)