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Pro Beautiful design with great build quality
The M8 uses an all-metal unibody chassis that comes in Gunmetal Grey, Glacial Silver, and Amber Gold. The metal unibody chassis is a key differentiator for the M8 and gives it a unique look and feel as well as great build quality.
Pro Great display
The phone has a bright 5" 1920x1080 LCD3 display with 441ppi. It has wide viewing angles and colors are vibrant with excellent whites and good blacks.
Pro Great speakers
HTC was one of the first to focus on improving the built-in speakers of smartphones with the introduction of 'HTC BoomSound'. The M8 uses stereo front facing speakers which are fantastic because the sound is finally aimed towards you instead of away from you. HTC also included built in amps to power the One M8 to 95dB without distortion.
Pro Great selfie camera
The 5 MP front-facing camera on the M8 is even higher resolution than the rear-facing camera and with comparable image quality.
Pro Expandable storage
The microSD card slot can expand the M8's storage to up to 128 GB.
Pro Supports Qualcomm's Quick Charge 2.0
Qualcomm's Quick Charge 2.0 allows for significantly quicker charge times. With Quick Charge 2.0 the time to charge the M8 to 25% for example will drop from an hour to only 12 minutes. Unfortunately, the M8 does not include a charger equipped to use the new technology in the box but will be an optional accessory.
Pro Available with stock Android or Sense
HTC offers choice between HTC's user interface and the stock Android experience.
Pro Good battery life
HTC One M8 has a 2600 mAh battery that according to Phonearena would drain in about 7 hours of typical use.
Con Rear-facing camera is just 4MP
The One M8 uses two cameras on the rear: the main 4.0 megapixel sensor and another 2.0 megapixel sensor that functions as a depth sensor. The M8's main sensor is a little low resolutions for photographers that rely heavily on their smartphone camera, but the resolution should be sufficient for social media shots and photos with little cropping.