Just got this reply from Buttkicker "The ButtKicker Gamer2 is expected to be shipping around the end of Nov. / beginning of Dec.
The ButtKicker Gamer unit itself is unchanged - it's the amplifier that is completely new. The new digital amplifier is much smaller than the original, comes with a wired remote control and is built rock-solid.
Utilizing the existing bass is really the optimal way to reproduce the tactile sensations in a sim or game because it's completely musically accurate. Force feedback devices can only produce a sensation in one frequency since they are just offset motors. Also, they must rely on preprogrammed queues from the game to operate. The only potential down-side of using the existing low frequency audio signal is that for some games where the audio engineers didn't put the time and effort into creating full-range audio effects, the ButtKicker has very little to respond to and therefor doesn't do what is expected.
If a stronger tactile experience is required you can try a few things, including boosting the volume of the low frequency audio, or adding a second ButtKicker system.
Thanks again - let me know if there's anything else I can help you with."