I have not heard any of the current offerings but do own one of their Reference IV models RSW-10d and it is a wonderfully musical, fast, and "accurate" subwoofer. The same can be said about the Reference II/III versions RSW10, RSW12, and RSW15. I am using my RSW10d with a pair of Klipsch RB-75 bookshelf(if you can call 32 pounders that) speakers and the combination is nothing short of amazing.
Bill
Bill