I sent back the M8 because screen was too small/tall (and camera was poor). The phone display has very narrow proportions, like the iphone 5, and it has an effective width of any other 4" screen. So even though it's a 5" screen, horizontally, it behaves and displays webpages as if you're on a 4" screen.
I won't go for this if the screen is only 5". To me, an additional 1/2" makes the phone MUCH more usable for reading/webpages, etc. I do not use a laptop and rely on my phone 24/7 for just about everything. The LG G3 is 5.5", fits my cases and pockets beautifully and functions great.
I'd love to make the move back to HTC for the speakers, clean interface "sense", and being able to buy the phone SIM-unlocked; i.e., no :"messing around" by AT&T or Verizon. Looks like I'll have to wait for the Max in the fall.
It is surprising that they do not appear to be following the trend to 2560 screen resolution.
To me, also, the M8 was very light. I felt it would almost fly away or drop out of my hand with a little breeze. I like something a bit beefier and less-delicate. I'd love it if they doubled the battery size!!!