They are not edge to edge ("case friendly" and I've had no issues). 3D Touch works flawlessly with their products. Get their glass versions and it feels like it's not even there (compared to their old "Original" style that felt like rubber).
I have Zagg Glass on my 6 Plus (Tech21 case) and my iPad Air 2 (Lifeproof Nuud case)and love them both! Their customer service really is the best! When requesting a replacement, if there has been an updated product come out, they give you the option of paying the difference of the two and upgrading. I will be getting the new sapphire glass when it is available for my unicorn device...7 Plus 256 JB.