Let’s say you’re a smartphone maker and you cook up a formula for a beloved, game-changing device. The next year, you tweak that formula a bit to create a worthy, if slightly less exciting, follow-up of a phone. What do you do after another year has gone by? Try something completely different in hopes you’ll catch lightning in a bottle again, or keep plugging away on the mobile DNA that made you such a worthy name in the first place? If you’re HTC, the answer is obvious: You keep polishing and polishing that formula until you finally reach the ideal you’ve been working toward.

That’s what we have in the One M9. It’s still a ways off from fulfilling the vision that HTC’s design wonks had in mind, but in most ways it’s a very thoughtful refinement of what made the One series so special. Your pleas and complaints haven’t gone unheard. The thing is, when the One M9 does try new things — be they software features or hardware changes — it doesn’t always stick the landing.
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https://www.engadget.com/2015-03-22-htc-one-m9-review.html