had my replacement GODOSMITH Ice Max 3D on since September 2016 and finally removed it last week. started noticing a ton of dust/dirt by the home button and top earpiece area showed some. removed it.
The adhesive backing coverage on that is pretty poor compared to the Anker GG+ I have. Its adhesive goes almost fully to the edge of the glass, and the ear speaker and camera areas are separate and fully enclosed, so any dust that enters from the speaker opening can't travel down the "channel" and obscure the camera opening.
The one flaw it does share is that the backing can't enclose the top two sensors, probably due to their proximity to the top edge, preventing them from being fully protected.
Dust penetrated from the opening along the top edge, and obscured the center sensor.
I got a replacement from Anker, then applied some clear RTV sealant along the top edge, "sealing" the gap. Hasn't been a problem again in the year or so I've had it installed.
But alas, Anker no longer offers the full-coverage GG+.