Here's a couple of links i dug up that go into some on the finer points of tactile transducers:
http://www.baudline.com/erik/bass/tactile_faq.html
They went to the trouble of some comparisons between the 'usual' brands based on specs
http://www.baudline.com/erik/bass/tactile_report.html
The terms vibrate and buzz are kicked around quite often, regardless of brand - I think that is perhaps based on a person's misconception that these things are designed to make your house shake like an import car at a red light
If you want chest-pounding bass at high spls, you're going to need way more than one or two 6" round metal disks strapped to your chair.
These articles seem to do a fair job at describing the ins and outs of transducers. For some people, they will consider them 'gimmicky' and dismiss the idea as crazy - others will start pumping you for info how to deploy them in their own theaters......We watched the movie 1408 last night with some friends - not a terribly 'bass-laden' show, but the audio mix with 'the things that make you jump' was good. My guests commented at the end how the seating had a huge impact on them for those scary parts (they know that the sofas are wired) and they loved it!
Again, I went with Auro Pro's since I wasn't prepared to spend big bucks for something I wasn't sure was right for me. After living with them for a year, I'm quite happy with them. You will get better quality/quantity by going with the bigger brands - it all comes down to how much money you want to throw around
