Not for me. I've been getting GREAT groups using 3F Swiss. Cleanup's not much worse than with 777. Stuff burns alot hotter than typical Goex. I've been switching back and forth between 777 and Swiss, and I like them both.
I think real black still has a place in traditional guns. For a flintlock, there's nothin' like the real thing!
I've never been a fan of Pyrodex, but if you like it, use it.