I installed a spigen glas.tr slim yesterday. Although it doesn't fit 100% I had no problem with the install and see no lifting edges. 3d touch works flawlessly!
I always say each time I get a new phone that I'm not going to bother with a screen protector. And then within a couple of weeks I see tiny micro scratches and I gotta have a protector.
I've been extremely happy with my Benks edge to edge protector for the white phone a currently have it on my 6 plus. I purchased a couple of spares and thankful I did as I don't see them selling these anymore. I'm hoping the fit will be the same on my 6S plus - delivering at the end of the month.