Yeah excellent - had it on release day last Wednesday. Everything works great on it, fingerprint reader is far more reliable than the OnePlus - quicker too, speed is awesome, camera is stunning, screen is stunning too. The charger speed is insane!
Was glad that it had AptxHD bluetooth which was the only worry, I had seen mixed reviews some saying it did, some saying it didn't. All my good wireless headphones are AptxHD enabled so would have been a pain if it didn't!
Had to order a case from China (Giztop) though as they are few and far between, and skins are non-existent so far too.
I kept on my existing deal with O2, just changed the phone - £0 upfront and I also renewed my airtime discount which I get through work (-25%) so it's worked out a fair bit cheaper than I was paying for the same 15GB of data. I also share that with my Tab S6 4G so it's enough for both devices.
Sold the Oneplus and just waiting to hear about the free headphones claim as I will be selling them too - so all in all, I am up compared to what I was paying.