I haven't seen much of any technical specs, but from what I hear it's supposed to be very nice.
Hang out at the Buwalda Hybrid forums and you'll know when they are ready.
http://www.buwaldahybrids.com/phpBB/
But the thing is this is just a individual midrange driver. You will need to wire everything up active and you'll need a 4 way crossover to control everything. Or at least a 3 way electronic crossover, and the sub out on your headunit. Plus you'll need more channels of amplification.
What exactly does your system consist of if you don't mind me asking?