I'm a product manager for Stash. I'd love to know more about what you find lacking in Stash. We've got a bumper crop of improvements in the works that we think are useful, but the more feedback to guide us, the better.
Stash, in my opinion, is the best git tool out there. Sadly it's sometimes tough to convince people to switch when Github is 'good enough'. Anyway, keep up the good work!