While I'm still a little skittish that it might have stability issues, it sounds just damn amazing. It is by far the coolest drum program I've ever used. The biggest thing is just the sound. It sounds and plays fantastic just as is. No tweaking needed, no faffing about. A lot of other high quality drums I've seen have had real issues with things like uneven velocity mapping and so on. Not here, it all sounds great, just as is.
I am also just loving the interface, with regards to tweaking and kit building. I like that you can have a really massive kit. None of this sissy "Oh this thing has a whole FOUR toms!" stuff. No, none of that. 6 toms, 2 basses, 3 snares, a bajillion cymbals, it is happy with it all. That is one issue I've had with a lot of dedicated drum kit programs I've seen in the past, like XLN, is that they assume you want a normal sized kit. No dammit, I want ALL OF THE DRUMS ALL OF THE TIMES! :D BFD3 seems quite pleased to do that for you.