Display: Top notch, no Neon fiasco like Samsung panels (I hate bright colors in general) The colors are a bit crisper and warmer than the ARC S and Xperia Ion, but very pleasant and still, of course. Sharpness is 1A.
Processing: Feels very valuable, but the edges were even after the repair is not mounted flush from the display to the loudspeaker enclosures (. The display was set wrong, so it looks at a corner on the edge on the other underneath) noted Through my Displayfolie If the sharp edges tangible but no longer. The buttons may also sit a little harder, you can hear when shaken but no rattling or clattering as unfortunately in many other of the case ist.m
Basic Operation / Reception: call makes me after a long time fun! Finally a phone that has a speaker that is not too low and not creak on. The microphone is also miles better than the ION! The reception is much more stable than the ION and ARC S! I have now no more problems with dubious "Mini dead spots" in Zentimenterbereich (especially in 3G operating in buildings made these smartphones such games ...) I use the way O2 (unfortunately without LTE, so I can not judge this) the reception of 3G loose twice as good as my old Sony companions. So too!
Endurance: The phone keeps me by 48 hours. But also have a very moderate use (night Advanced Save, during working hours is mobile internet off). Whatsapp I use about 2 hours a day. As the battery behaves however if you have just laughed at a new girlfriend, much writes and phone I can not say at the time when freshly separated again * lol *.
Multimedia: Watching movies is fun on the giant screen :) The sound from the speakers is (brutal) loud, clear and bassy (you should for God's sake, the phone does not compare its investment at home or in the car). Technically sound probably the best phone, at least as far as the speaker. However, the supplied headphones are SCRAP except highlighted Bass they have nothing. Boom sound with headphones is also scrap. And the most fatal: No Equalizer! With my Sony headphones (MH750 my IONS) and off Boom sound but the phone has 1A sound, even if the bass is a bit weak then (I must go with other headphones test). In this respect I commend the Sony Walkman with the equalizer, the phones are true sound equipment (but not as nice as loud as the M8: D).
Camera: I like personally very well. A lot better than Sony (especially in low light conditions this Pixelmonster stink totally from). However, only the focus sometimes makes so strange things, one can certainly fix with an update. (The ION focus was gone after the update: D) Can the often negative criticism of this camera do not understand both front and main camera make very good photos. Sure, there are "only" 4 MP (what man actually makes large posters of his mobile photos ???), but the photos are much better at my ARC S and ION!
Overall, I am very happy with my HTC. However, I have to deduct a star, because it simply can not be that perceived 70% of the production of this model is cast as a beta test scrap on the market and sold as new.
UPDATE: before yesterday the 4.4.4 update for my M8 Dual Sim uploaded. The battery performance has noticeably improved again. You notice it especially in advanced power saving mode when I turn him overnight. Previously Be Lost cell phone overnight within 9 hours 3% battery now (!) 0%. For the M8 now gets the 5 star :) Very good care model HTC!