I switched from the gs3 to the M8 and the first thing you'll notice (not a bad thing) is the weight. It just feels different in your hand. No more light warm plastic, this stuff is heavy and cold to the touch when left out for a while. Anyway I use a case so that doesn't really matter. As far as software goes, the amount of HTC apps I use with the device is significantly less than I did with Samsung, but that is partly also due to custom launchers, keyboards, messenger apps etc. The only thing on the HTC phone that I use is Camera, Gallery, and Flashlight. The system UI is nicer and more clean with sense. But you lose the blue vibrancy that was popular with the themes in touchwiz. Speaking of colors you do get used to the LCD screen compared to amoled, just not the contrast between the deep blacks and other colors.
Really switching between android devices is a lot easier now with services expanding platforms and cloud storage backing up almost everything. If you like the build quality and the stats you should give it a try! HTC has won me over and it would take a whole lot of pizzazz for a new S phone (other than the note) to impress me.
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