The RS1202 is interesting. The cabinet weighs a ton, but it should be very inert due to opposed drivers and massive bracing and heavy panels. The drivers are the RF series, very low inductance, with three shorting rings, so it should be very low distortion. Only problem is (aside from the weight) that the Dayton amp has a undefeatable high-pass filter, which is a no-no on sealed subs, as far as I am concerned. Still, in the music ranges, it should be very good, especially if you wanted to set something on the cabinet and not have it vibrate. I doubt it will keep up with the Hsu subs though, however, at moderate listening levels, it should be an extremely clean sub. I would still go for a VTF3 or a ULS-15 over the RS1202, but there is some interesting design choices in the RS1202.