ButtKickers, when properly mounted onto substantial material, can produce 'realistic Bass shudder and thump. Mounted to seating they produce a Bass enema that is decidedly NOT realistic. That some actually find it stimulating is no surprise. It's a sensitive area prone to such reactions.
But the real issue is money. marketing it with a cheap ass amp that effectually costs a bundle, and works only to power an overpriced device is all that gives it an edge over the Clark Absolute Transducer, a truly well designed device that I also find deplorably overpriced. and they are too big, and mounting is enefectual for many applications.
Auras have no real Cosmically significant advantage excepting that whenever you can dissipate tactile force more evenly by using "cost effective" multiples that are driving at less intense levels individually, but by the weight of sheer numbers are more efficiently "shaking" a larges area of a specific mass instead of the energy being extremely focused, your gonna get a more realistic effect that resembles the intended special effect, instead of some obscene Troll with a 20 lb sledge whose hiding under your chair trying to give you a cheap thrill.
Still, it is all about what you know, and experience. ButtKickers go out the door installed by the Factory under Berklines everyday, and they are hot sellers.
Seems to be a lot of willing Perverts out there sitting back, getting happily goosed.
But I'll say this, anyone who has tried equally designed systems, power wise, always chooses the "Tactiles' to the BKs. It's obvious I'm no fan of 'seating based' tactile effects, but I do realize that for some, it's that or nothing at all. In those cases, I'm glad they have options. So is their Proctologist too, I'm sure.
I prefer 16 Aura Pros arrayed in the Flooring/Platforms, and being driven by ample, high quality power. I get 'em for less than $40.00 ea. and at that price, 16 of 'em cost less than 3 BKs, and can drive the flooring of an entire room to spectacular levels. What I've yet to try is the various filters or such that many now swear by. I need to review this thread to glean that info, for top notch, realistic performance, no matter what the product your using, it what it's all about.