For a free download I guess this might be called a no brainer but as for the different presets I'm not so sure.
I think they're just using one kit and then using the on board effects to get their different styles which is fine in theory and something addictive drums does brilliantly considering it's 2GB library but the on board effects are poor IMO so I'd
be more inclined to use other effects.A lot of the presets I just listened to sounded awful and plastic to my ears.
The snare has a terrible ring that's almost like a droning noise as it just doesn't tail off like it should.I know it's hard to argue with free and I feel mean to criticise it but it's probably not going to get another airing on my DAW.
The mixer is hmmm.... interesting but I'd sooner just route all tracks to sonar and do it all in there as it's only slightly better than using kontakts mixer. I do feel quite spoilt having BFD2 mixer and effects whenever I use other mixers

I don't use midi loops except to audition kits quickly but some people will want them and they sound ok.
Do like the fact that they can be mapped for other drums vsti's so it's not all bad
Steve
Another thing, changing the mics may seem great but a bad sounding kit will sound bad regardless of the mics you use and changing them for me seems to make very little difference.