The HTC One M9 was HTC's 2015 flagship, and has been replaced by the HTC 10.
Pro Good display
Bright 1080p display with vivid colors and good viewing angles.
Pro Great front-facing speakers
There are two front facing speakers (one above the screen, one below) which act as high quality stereo speakers. They face towards you too, making for a much better listening experience
Pro Good build quality
The body is crafted from a single piece of aluminum, and the plastic antenna lines are flush with the metal making for a seamless feel.
Con Can get warm
M9 can get warm to the touch when performing resource intensive tasks such as gaming or streaming HD videos. It doesn't overheat, but it can get comparatively more warm than flagship phones generally get.