I was coming from an X and XS and planned on not liking the 11 and doing the return for the Pro model....but I still have the 11 from Launch Day and will be keeping it. Do miss the Tele zoom (but to be honest a 2X zoom of what is a wide angle lens to begin with is not much of a tele IMHO) and really enjoy the Ultra wide angle (and yes, I am a photography - mobile and real camera - enthusiast if that means anything as I was looking forward to the Ultra Wide angle lens).
The screen - and my eyes are still pretty good - is great - even after playing with my XS and the XR in the Apple store to see the "difference", but YMMV. I do like that the screen is overall a bit larger than the XS was - though my wife, who came from the 8 Plus did prefer the slightly wider screen on the 8 Plus over the 11, but she likes that the overall phone is slightly smaller.
So, to answer your question - no did not return my 11 and don't plan on doing it either. (And to be honest the difference in price, which was about $15 per month on the iUp plan, was not really part of my decision.)