Painter 11 is out, in case you hadn't noticed. I'll comment on this as soon as I get it (which may take a few weeks). In the meantime, you can judge yourself from the list of new/changed features whether you should upgrade. I hesitate to say anything either way, since whether those features are useful to you really depends on whether you use any of those tools often.
I'm sorry for not updating more often; my RL is extremely busy.
(NB. I am planning to make a brush creator tutorial eventually, in bits and pieces. It's just that a comprehensive brush creator tutorial would have to literally be multi-part and extremely detailed, and would take