I've had an iPhone since 3GS and this is the first time I can remember I've really regretted an update. I've NEVER experienced my iPhone completely locking up for 5-10 minutes right in the middle of me trying to get work done, not allowing me to even force-reboot it.
I have to power cycle it at least a dozen times a day now because it gets into a state where apps will no longer launch until I do it.
I'm not really a whiny user, but this is a whole new level of suck I've never seen before. It's a Windows ME grade of garbage release. Very disappointing as I felt iOS 10 was bulletproof and I relied on my phone to have my back as I was traveling and working, and now I'm constantly hoping the next app I switch to doesn't disable it for 10 minutes right in the middle of me doing something important.