I upgraded from M7 and I think it is worth it. The biggest three things for me:
Better build quality.... Seriously the closest thing to perfection on any device.
Much improved battery life
Much improved front facing speakers.
Those three things alone are worth it. I do wish, however, that they would have stuck with the capacitive buttons. I still see no point at all for the software buttons. When Google released this, Matias Duarte and others were saying that it was for customizability, and how the buttons needed to change with each app..... Well, three years later and still no customizability and buttons don't ever change with apps other than them disappearing which just makes it more inconvenient to bring them back up to exit an app.
When the buttons are customizeable and change, then perhaps there is a use for software keys. Otherwise, they should have stuck with hardware capacitive.
Rant over. But yes it is worth the upgrade.
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