Moved a rather big, produciton running, project (100000 LOC) recently. Was not easy but now I've this very warm, conforting feeling, that if something happens in the future, I'll be ready for it :-) (now considering the adoption rate of P3, I'd say the future is, well, rather distant :-))

For me unicode was the reason to switch to 3, not everybody lives in an english-only world :-)