Had to revert to 8.1 because I've got friends coming into the city for a very significant birthday on Tuesday, and I can't risk phone crashes or call problems. Figured I should give myself a day spare between reinstalling the old OS and Tuesday, in case I needed time to fix any issues.
Reverting with the Microsoft tool worked perfectly. I miss WP10 immediately, even though it was only a temporary stepping stone to the much better-looking version seen in the MS blog. This all feels really toy-like and wrong.
[Morning edit] Praying for a WP10 TP update soon, tbh
[edit2] Oh, and... as I've been telling people with L920s, your battery always did drain quickly. WP10 is no worse for this!