I have upgraded an iphone SE, ipad pro 12.9", iphone 6 plus, and have a brand new 8 plus on ios 11.
The iphone 6 plus was a stuttering mess for the first 12-24 hours, but after that performed better than what i remembered previously and i even briefly reconsidered getting the 8 plus.
No issues at all on the SE and ipad pro.
8 plus has 0 issues as well, for me this has been the least problematic release for a while, with ios 8 being the worst, by a considerable margin.
The iphone 6 plus was a stuttering mess for the first 12-24 hours, but after that performed better than what i remembered previously and i even briefly reconsidered getting the 8 plus.
No issues at all on the SE and ipad pro.
8 plus has 0 issues as well, for me this has been the least problematic release for a while, with ios 8 being the worst, by a considerable margin.