I strongly disagree with respect to unicode changes. From my perspective, where 95% of my Python is Python3+Twisted implementing obscure and obtuse protocols,

I strongly disagree with respect to unicode changes. From my perspective, where 95% of my Python is Python3+Twisted implementing obscure and obtuse protocols, the strong firewall between byte strings and character strings plays a key role in my keeping my sanity. Unicode + byte strings alone are worth moving to Python3. I also make heavy use of other new features, I can't imagine going back to Python2.