This update was actually a blessing in disguise for me. I have had some quirks since the phone was new, and reboot issues on and off ever since. Yes, I lost 5 hours of my life restoring the phone... but it has worked pretty much flawless ever since(and I hate saying that... as last time I did, it took a dive within hours of posting). Had I known that this would have fixed the quirks that I was dealing with, I would have restored it long ago.
Now I will say that my 735 is "almost" as good as my 928. LOL
I know it's a few days ago but I'd just like to say that I had more or less the same problem with my 640XL.
I had left it on charge on Friday night and had the endless re-boot issue on Saturday morning.
Tried all the possible hard reset options etc. but to no avail.
Thinking that the battery (it is a few years old) might have died during the charging process and couldn't hold sufficient power for a full boot, I ordered a replacement for £15.
I don't know if it's the same for other phones but mine can't boot via USB alone - the battery must be installed and a faulty one would presumably be useless.
I then learned of this update and managed to reset the phone with WDRT, which took several hours because I had to go through WP8, upgrade back to WP10 and then try to get everything back to how it was.....which it now more or less is.
I don't suppose Microsoft are prepared to reimburse those that sent their devices in for repair and maybe lost data......or spent money on parts they didn't need.
Still, not a bad idea to have a spare battery, I guess!
I know there's an element of risk being on the Insider programme but I understand this might have affected other users too....a tad careless on the part of MS, but at least it shows they're still developing the eco-system.