I can't comment on the Buttkicker line, but I do have 4 Aura Pro shakers - 2 for each sofa. I wanted to take the plunge without spending a ton of cash, so I opted for the 'cheap' solution.
For myself, I do think they add to the movie experience - with the caveat that they have to be done 'right'. Initially, I had them running with my sub xo at 80hz or less - for me, this was too much - they would actuate with door slams, deep voices, and other events that didn't necessarily tie in with deep bass or an impact. I used the other channel in my BFD to have them roll off at about 45hz, and now find them integrating better with the audio. Some have used inline low pass filters to achieve the same results. Additonally, setting the output level I think is crucial - not so much that it feels like you dropped a coin into a slot in the arm of your chair, but just enough to 'add' to the audio without being really obvious. When you first install them, you're likely to crank 'em up for the first while until the novelty wears off
Another plus, is that if you're watching something at reduced volume (people sleeping), it at least still gives you a sense of bass without flexing the walls.
Test drives with guests always sparks positive comments - they do know something's up, but are never quite sure......
They certainly do not pound your chest, or inject that visceral feeling, but the nuance of physical rumbling when something explodes or crashes I think does add to the experience. But as with all things, it's a matter of taste and may not be all things to all people. 10hz at 105db is a way different thing, and I don't believe any shaker can mimic that!! But it could possibly serve as a 'seasoning' for your auditory meal.
Cheers,