I had the M8 briefly and I liked that i could edit the background with the 2nd camera. Unfortunately HTC at the time was stubborn with their 4mp "ultra pixel" nonsense.Yep, I thought there was a few others before the 7+. But wait, we will have everyone telling you the iPhone 7+ dual camera is better than all of those. I can tell you from experience, the dual camera on the 7+ is a gimmick. It is only used when doing Portrait Mode, which really only works when you have maximum lighting.
EDIT: By the way I cant believe Morpheus is on macrumors.