From S&W, stippling voids the warranty because it "damages the frame." I inquired if it voided the whole warranty, or just anything relating to the frame, and I got the same response. This sucks. I don't want to waste such a great warranty, but my Shield needs something ...
Thank you for providing this information. I was thiiiiiiis close to having it done next next month, but no way. I won't risk my warranty being voided no matter how much I like the stippling work. If you or your wife are still looking for an alternative, look at Talon grips. I heard they are great and I've already order a set to try out before I got my stippling job done. After reading your post, I'm glad I ordered them. Here's a video that helped me make my decision. I have the M&P full size. Thanks and good luck.
[ame]https://www.youtube.com/watch?v=ZAdbhcwG0iI&index=2&list=FLiHiO_b6NUAZc9ixZq4kOLA&t=439s[/ame]