BFD has it's merits but it's triggering engine (IMO) is inferior to...erm...Superior's in regards to Metal stuff. I've bought both samplers and DFHS sounds more natural when I A/B them with the same midi source file. Even when tweaking the time and velocity options in BFD and Cubase I still find it to be Machine-Gun city on faster patterns.
I do use it on occasion (triggered by Drumagog) to blend in a snare or kick sample with the original drum, but it's further down the pecking order in my choice of drum engines than DFHS or C&V which cover pretty much all of my bases. I also find BFD to be flakey as hell and prone to crashes and it has generally screwy behaviour in comparison. Superior's never crashed on me once.
The workflow and interfaces on both applications are different. I prefer Superiors, but opinions vary depending on the forum. BFD 2.0 is out soon.....will have a look to see what's changed.