Updated my unlocked Htc one about an hour ago. Update came in two parts, first a small file that required a restart after installing. Then checked updates again and the big one was there. Took about 10mins to download and maybe another 15 or 20 to install and do its stuff.
Looks good so far. Theyve removed the option for changing lock screen wallpaper but if you're like me and use a widget on your lock screen (calendar widget) then don't be alarmed if its not there after the update. It is still there, only now you have to swipe from the right to see your widget, also swipe right again and you can add another widget screen....Pretty cool I think.
Also you can now disable blink feed entirely if you want or add more feeds.
Phone feels even quicker than before although I might be just imagining that.
Can't comment on battery or anything like that yet as its only been about an hour since I updated.