Do isolation devices really help?

No they don't. Just think about this. After you put all your electronics on the best cones, pads, concrete, whatever; how do you keep them safe from airborne resonances? They can't. Case closed. You should couple, not decouple. I could go on, but is would be a lot easier for me, and you as well, if you (I just wrote this review, a week ago)go into the archives and look up Sistrum Mini Monitor Platform. There's oodles of stuff in that review to get your gray matter perking.

Where does all the air born resonances go to after they get into your electronics? How do they escape? It would seem that these isolation devices, in themselves, help keep those resonances right where you don't want them. You want all resonances to escape and go to the floor. Everything should, rack as well, be coupled with cones. I use Audio points, and am very happy. Sistrum Rack System does this (resonance transference) better than any I know of, as do their speaker support systems.