Thought I'd pass along that my new 128GB iPhone SE from Verizon I received yesterday shipped with iOS 11.0.1.
My current 64GB SE is still running 10.3.3, so I decided to try restoring my 10.3.3 backup to the new device and test both in parallel to see if there was any issues with battery drain (which was my main concern from other reports on the web).
So far I would say no problems with 11.0.3. The upgrade finished last night and I kept the 11.0.3 and 10.3.3 devices on a charger overnight. This morning I played around with both devices, clicking the same buttons, browsing to the same sights and letting both receive push notifications from my apps.
After a half day, the 11.0.3 128GB SE (which I have running cellular service) is at 79% and the 10.3.3 64GB SE (which is just running Wi-Fi) is at 81%.
Considering this is less than a day with the new OS I'd expect this is worst case for battery drain, so I'm feeling confident I will keep reasonably the same battery life with 11.0.3 and hope things may improve with subsequent updates.