I had the M9 and wasn't planning to upgrade until I shattered the screen on a particularly hard drop. Assurion didn't have any more M9s and offered me a new 10.
Things I like better: 1. FINGERPRINT SENSOR!! Never thought I'd need it, now can't imagine not having it. Super fast and accurate, way more so than my friends with Sammies. So convenient to know my phone is locked, yet can still be unlocked in a split second by touching the home button.
2. Camera: Huge improvement over M9. Much faster, much better pics, although a small learning curve because the software is different, especially with regards to adjusting exposure. Once you've learned it, it's great.
3. Size: I didn't think I'd like the larger size as I have small hands, but honestly it's easier to grip and I've only dropped it a couple times, compared to several times a week with the M9. Also, keyboard can be resized to work with one hand without reaching all the way across.
4. Headphone sound: Unbelievably good sound quality through the headphones makes up for the lack of dual front speakers. Speakers are good, just not as good as M9. Speaker phone is much louder on 10 though, which is a big plus for me.
5. Overheating: Definitely doesn't get nearly as hot as M9. I couldn't do video calls for more than a few minutes on the M9 without it overheating, no problem on the 10. Also can charge while browsing or on the phone without it getting the least bit hot. Not even running GPS gets it even close to as hot as my M9 got regularly.
Things I don't like: 1. No HTC KEYBOARD!! This is a big miss in removing some of the HTC apps and I'm still struggling to find a keyboard that handles swipe typing as well as the HTC keyboard did. I've used the default TouchPal, Swiftkey and the Google keyboard so far. This is my one major complaint and it's quite an annoying problem for me that I still haven't solved yet. I have to retype a LOT! Hoping to still find one that works well for me.
2. No HTC Gallery. Another HTC app removed that shouldn't have been. Definitely don't care for Google photos and miss the edit options from HTC Gallery.
I think overall it has huge plusses over the M9 with two drawbacks.
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