The wookie, like most wizards, is really just a means of getting addons onto your box automatically. If you have instability it is more likely due to other issues. Over the past 24 months of using android boxes I've found the technology is far from perfect and software/hardware mismatches are common. It is worth taking advantage of official ROM upgrades if they have proved to be stable - in which case recent droidbox firmware updates may be worth considering.
I would say my t8, with its original firmware and running the current wookie wizard is stable enough.