So I've had my 6 plus for about 5 weeks now. I started with 8.1.1, upgraded to 8.1.3, then to 8.2. Once it was on 8.2 it was almost unusable. There were so many bugs and I was dropping emails from my work account. I went in and they put a fresh 8.2 on there and voila! No more quirky bugs, it was pretty smooth. Even swiftkey worked no prob. I went to 8.3 last night and ugh! It's slow and clunky and touchid only works under certain conditions. Sometimes there's a multi second delay when I hit the home button before the screen shows up. I'm considering taking 'er back in for a fresh one. The Uptown store here in Mpls is really good.