Just upgraded from my four year old 6s to an iphone 11. It took a small while to get used to there not being a home button but all good now. Battery life seems wayyyy better (even after i got my 6s battery replaced a year ago). The camera is obviously leaps and bounds ahead of the 6s...so much brighter and wide angle is great.
In fact, as a professional wedding and event photographer with thousands of pounds worth of nikon lenses, I actually find it almost a little depressing how good these smart phone cameras are these days
A tiny bit annoying that it can't show battery percentage due to the notch, i hadn't realised that. Though i do know that you can just swipe down from the top right to see all that info. Very minor complaint of course.
Overall I think it's a good upgrade. I could have easily carried on using the 6s for another year or even more, but 4 years is a pretty respectable amount of time to get out of a phone so I thought I'd treat myself. Also, my 6s suffered from the (known issue??) of rather low call volume. I always had to have the volume at max for it to be acceptable and often would have liked it a bit louder really. Tried all sorts of fixes to no avail. Happy to report that the 11, as expected, is nice and loud in this regard!