I think if you actually play the drums, these are strictly supplemental. The exception being genres that are mostly artificial in nature. Even those can often benefit from real drumming, even if it's just as a sample source to chop. As advanced as this software is, it simply cannot duplicate the subtle nuances of a human yet. These midi paks are great because they are played by a human and essentially provide the best of both worlds. The downside, for lack of better term, with these midi paks is most need other adpaks to truly shine. The samples in AD are incredible, but it is odd that they chose not to include any percussion except cowbell.