i put a ff kit on my HS2, and i was like, yeah, that's pretty cool. put a pp kit on my BSD, and i was like, uuuh yeaaah! the knob on the sub makes all the difference. glass shakes on that sob. it was the standard kit sub, too; not the upgrade. pp, hands down.
now, in the last week or two, i hooked up a psw10 to my CV using a pinnovator sub board. not sure i'll ever buy another speaker kit, again . that's really my vote. you can actually hook up 4 games to the same sub using their mixer, too. trust me. you'll thank me later.