Amazing!

That's my one word review. Now to be more specific, I have two of these beasts in my HT, powered by JBL Synthesis® S800 amps, bridged to 800W mono. These are foundation shaking, yet articulate and agile subs, whose high sensitivity and powerful motors make them both unstoppable and virtually unbreakable. Properly calibrated, these easily go down to sub 15Hz territory. Your pant legs will flap when the LFE demands it.

Be sure to have a room of sufficient size (check the specs) before getting these, as they'll overpower too small a space. But if you've got the room and the power, these are pretty darn hard to beat.