I got on the Pro Audio kick with my SFE-812 build and gotten hooked on the drivers for several reasons. Yes I do like to listen to music loud, but not ridiculously so (say 90db at the listening position), many home audio driver builds can get to that volume but can sound strained. The sound of a good horn tweeter setup is also very appealing, the cross over low and if controlled properly have a very smooth and natural sound w/o some of the sibilance and "sssspitinesssss" you can get from a dome tweeter. Making sweeping generalizations here obviously.
Pro Audio subs and woofers also have a very sharp "attack" to transients that I've had a hard time duplicating with more traditional heavy and low Fs subwoofers. I wish I could invite you over to my listening room and do a session with the SFE-812's, they are jaw dropping-ly powerful speakers and do everything well, imaging, volume, detail, accuracy, smoothness, they are truly engaging to listen to. These Rally Sports have a similar quality, they get effortlessly loud and say detailed and accurate.
Also wish MWAF wasn't so far away, I'd haul them out.
I'll post some videos of the Rally Sports later this week, I started listening to them this morning and left the house an hour late just because couldn't rip myself away, fun stuff!