Programmed Drums

Is Slate just samples or does it have a full programming interface like SD2.0? If it has an interface, how does it compare to SD2.0?

I see SD2.0 is down to $149 if you do a google shopping search. That's cheaper than the EZD crossgrade.
 
Has anyone tried BFD? I have Addictive Drums and they do sound really good, but you have to work with them lots.