I agree with Phasecorrect that there is some element of snobbery towards the Sunfire products by some in the so-called "high-end" community. I have a good friend who works for a top high-end store in NYC. He laughed at me when I told him that I had bought a pair of Sunfire Signatures (he had tried to sell me the REL Strata III, Storm III and the Stadium II, he has since "seen the light" much to his chagrin). I could never (to my satisfaction) blend, successfully, the RELs with my highly modified Magnepan 3.5/R. The RELs were too "boomy" in my listening room and relied mainly on placemnent for blending due to the absence of a continuously variable Phase control. The Sunfire Signatures were a revelation in terms of their ability to be seamlessly integrated with my maggies. I was surprised by the thigh, defined, smooth and dynamic bass reproduction. The Subs were dead quiet (no audible hum). The blend is so seamless that you cannot detect, easily, the presence of the subwoofer.
With the stereo Sunfire Subs, and my maggies, I have been approximating the performance of the "mega-bucks" speaker systems. In my room, I have almost flat response from about 16Hz to 20kHz. The bottom line is that the Sunfire Subs have enhanced, greatly, my enjoyment of the music.
I could care less about the opinions of those who propagate the negative propaganda about a very fine product.