There are issues with full screen protectors. I don't know why Zagg won't make one, as the invisible shield, seems to me as the only option (see below for why). I used to be a big fan of zagg invisible shield, but, have since switched to glass, prefer it.
There are 2 things with iPhone 6/+ that cause issues with full screen protection:
1) Yes, the far edges are curved, this presents a big challenge for the people making protectors.
2) The entire screen is very thin and actually flexes near the edges which is why a full screen rigid protector such as glass will not work at all. Any full-screen protection will have something other than glass at the edges, and, usually this will allow dust/debris under the edges of the protector, (read the reviews). This is the major difference between iPhone 6/+ & all other iOS devices (so far).
I have opted for a non-full-screen glass protector, and love it. I prefer the smoothness and clarity of glass. And I have full-screen glass protectors on my iPhone 5 & iPad Mini, but, those are flat devices.
This is the one I have, and highly recommend, it is electroplated glass instead of oleophobic coated, it is the smoothest glass protector I have (out of 3 different brands) it barely smudges and cleans easier than oleophobic coated glass:
http://www.amazon.com/gp/product/B00OKVSCRS/ It is not full-screen, but covers the image area of screen. (see my review by Benjamin on Dec 16).
