I've only tried Basscube and Basic Performer, so maybe it's off topic
BC is simply the best I've ever heard. It has very detailed sound, highs and high mids, very nice and natural. And enough and fast lows. My GK 700RB sounded like an old radio comparing to BC...
BP is still great, but there's others at this level, probably cheaper (try Schertler, for example). I think 4x6" is not enough to get the lows I need. At higher level it sounded overloaded, and started to getting slower. But still very good, I think.
