The 12.1 and the 12VQ are actually quite different. They look nearly the same from the front, but the 12.1 has a 2" VC with no variable Q inserts, while the VQ has a 3" voice coil and variable Q inserts. I have owned both, and can say that i like both. I felt that the 12.1 really was a beautiful sounding woofer, but did lack a little in the output department. The VQ deystroyed the lows, and was pretty loud(it took 657watts with no problem), but i felt it lacked a little in the higher frequency bass. I just bought an RL-P, and it it has the best of both subs and a little more. I would say the VQ is great, and if you can find a used RL-P(classified section here has one) then even better.