[HTC 10 Questions & Answers] nex0rz:
I'm gonna copy my experience I wrote this morning from another thread:

- Design and Build Quality:

The design is better on the HTC 10. It feels great in your hands, and it's a really solid little tank, seeming to be way more robust than the 6P. The 6P was well built, but I wouldn't say it was top notch (gaps between display glass and frame, camera visor, etc.) - Whereas I would consider the HTC 10 to be one of the best built phones I ever held in my hands. Really. Worth to note are the fantastic buttons and their Layout, which wasn't great on the 6P. Also, the size is simply perfect for my hands. I don't miss the size of the 6P, the HTC feels especially better in one hand and never feels too small to me. By the way:

[youtube]tS3NLCPK4NI[/youtube] <- This is straight Nokia 3310 quality and it definitely feels like that.

- Display:

Where I was the most sceptical about was the Display. I sweared to me to never buy a phone without an AMOLED display again, since the black levels on my last iPhone 6 and f.e. one of my older HTC M7 were straight horrible. Light grey, to be precise. And I just can't stand that. I gotta say, that I'm still insanely surprised about the HTC 10s display. You would almost think that it has actually an AMOLED display since the colors pop and shine. It's not as unnatural as the 6Ps display, I would say it's overall more appealing than the AMOLED one (what I didn't expect at all). Also the black levels: in darker rooms, they seem to be dark grey, which is fantastic. You won't notice the not-black-to-black-bezel until you really focus on it.

- Sound Quality:

The 6P was (especially with some EX tweaking) way, way louder while the HTC 10 is clearer and sounds more 'full' and also warmer, especially in near field, f.e. while laying in bed and watching videos our listening to music. But when you want to fill a bigger room or want to 'party' outside, you definitely need some Bluetooth speakers - it was possible with the 6Ps volume, tho.

- Camera:

The app is without a doubt so much better than the Google camera. The auto point and shoot mode isnt nearly as good as the 6Ps (I miss the Auto HDR mode in darker situations that made photos so much noiseless), but with at least some easy tweaking (EV), you get some great quality photos that CAN come out way better and more interesting than out of the 6Ps camera. Not to mention the fantastic manual mode... Oh boy! OIS on both cameras is a great thing, and the selfie camera also is a great to have thing, since it is really, really good.

- Battery life:

Yes, the battery life... I was surprised, but I can also assure you that it was and is - out of the box - so much better than the Nexus 6Ps. I still can't find out why, but the 6P gave me like ~3h SOT at max, even with some Kernel tweaking. With the HTC 10, I get like 4-5h at least, and I never had problems to get through 2 busy days. I am sure that their is some more potential, when you notice some people in the Battery Life Thread having more than 7h SOT. That was the biggest Wow factor and surprise to me.

- OS:

Hell, I don't miss stock Android. Not. A. Little. I would go even further and say that HTC did the best interpretation of Android with their Sense UI so far. It feels like stock Android in every way, but the feature set is so much better, you honestly need to experience it. Camera app, Display settings, Sound tweaking, Display gestures, Night light, some great HTC Widgets and Apps (which you won't even notice if you don't use them), etc. etc. It's just really well thought and implemented, and I gotta salute HTC for doing such a great job of adding features while maintaining the stock Android feeling. Did I mention the performance is also incredible and better (yes, better) than the 6Ps? It just feels more fluid and quick when you actually use it. In every situation. The 6P sadly had some let downs, not bad, but they occured sometimes. Maybe due to the SD810.

If you want to know anything else, just tell me. :)

All in all, it was definitely worth it. At least to me. I owned 3 Nexus devices so far: Galaxy Nexus, Nexus 5 and Nexus 6P. I don't regret it a single day. Considering the price of about 400€ for a HTC 10 and the disaster the Pixel actually is (Price, Design - Seriously, it looks like a fat plastic phone for 9 years olds), I can just recommend the same for you. If you want to mod, you can mod easily, but once again, I didn't even root the 10 and it still is an amazing phone, since it's truely feature rich. It has no true weaknesses, unlike the Nexus 6P. It feels way better and more safe in your hand, unlike the 6P. It's way more solid and simply a beauty.

You can't go wrong with it. But it really depends on what you actually want to do with and expect from your phone.

Oh, and switching over to the 10 is fine. Sense UI looks and feels like Android, even more, it feels like what (Stock) Android should really be. The tweaks and features HTC implemented are great. And again: if you want it like stock Android, you can have it like stock Android - just don't use the (hidden) HTC stuff. This might be the only thing you will regret tho. :d