Wow 2012 one page 2014 the next. The ever going battle of Bill vs isolation pads. While I'm mostly on Bill's side due to my own experience, it does seem there are quite a few reports from guys on these forums that they have had improvement with rattles/buzzes/noises in their homes, usually citing a wood floor of sorts, with an isolation pad or puck of some sort (I believe SVS sells sorbothane based feet also btw). The rattles/buzzes I've had I've solved by attacking those particular vibrating items, I've never done any kind of isolation with my subs. I just moved and if anything this new place might have a wood floor less solid than my last one, but not by a whole lot. I have four subs operational in the house, all sitting on bare wood floors, and while this house has been modified since it was built, the floors don't seem all that different in construction.
OTOH, I have one dual opposed sub which is quite inert (it's my tv stand, and I do have a rubber mat that the tv sits on but more for the protection of the sub from the tv stand than the little vibration you can feel in the sub's cabinet); two others with a front firing driver but dual side mounted passive radiators so maybe that's kinda stable too; last sub is front firing and front ported. Other than the dual opposed, the cabinets are on the light side of things.
I do sorta remember Mark Seaton weighing in on the subject briefly to say a sub of his (not the dual opposed Submersive) did have some sort of floor movement they resolved by making it more difficult for the sub to move. I couldn't find that in a search, though, and my memory is suspect!
I'd really love to see the guys at Mythbusters have some fun with subs and this particular issue (like when they used a crankshaft on a huge cone in a car for some sort of record).
Now, for whatever it's worth, I don't think I've seen a single Auralex or other isolation device customer indicate there was an actual sound quality improvement from the suspension alone (rather than the absence of annoying vibration sounds). I also think this is a bit of a solution in search of a problem for most of us....but some new sub buyers think of these as needed accessories, which they should be better informed about....