Ah I'm getting data thrown at me. Now we're talking! I must admit I need to become more adept at interpreting data sheets on STC but the fact that there is data says something to me already. I've been looking at the comparisons too and I'm (slowly) coming around to this green magic...
I think what bugs me and turns me off is hearing others gush about a product in senseless ways. For many it's is all they need to be sold, but for some reason it has the opposite effect on me. (I'm often accused of being too rational!). There's another in-depth discussion on Gearslutz
on this topic. Here too you find many proponents of GG, also among the experts/respected contributors, though unfortunately it's also peppered with the kind of non-sequitur comments that I recoil from. Here are some of my favorites just for fun:
, concluding GG works despite having used a different product:
"the stuff works good. I actually just completed my build with QuietGlue, which is very similar. it was actually a little cheaper, and there was no nasty smell. I didn't use it between all joints, but i did use it between all layers, and I'm pretty dang pleased - from everything i can tell, it's helped greatly."
Or the commentator in post 55
that admits (in the very same sentence too) that it's impossible to conclude anything, but happy that he used it anyway.
"I spec'ed GG into my room build. Obviously, I can't compare to NOT using GG - but I certainly got the results I was shooting for."
Similar sentiment with this post:
"I used GG in my wall construction as well, and the results have been fantastic! I have nothing to compare it to however, so I cannot say for sure that I would not have been as happy without it. I think that the entire process adds up to sound transmission reduction, and I am very glad that I did not cut any corners as my room sounds fantastic (and quiet!!!)"
I think this last one encapsulates well the intuition that kicks in when you think about applying a flexible goo between layers. It just intuitively seems like it will work. It's easy to apply and once you do you feel good about your efforts. If the overall result is pleasing, it's natural to attribute all the success to the special sauce, without which it's, well... just a regular sandwich! Such a great product. As I said earlier, I wish I'd invented it.
Alright done ranting... no wait, just one more...
The presenter shows how two layers of wood stuck together with GG can still twist and move. But in real life that won't happen with all those screws (that you need since it's not actually an adhesive) preventing the layers from moving even a millimeter!