I just upgraded my 340 main classics to the SE's. I had to PRY the the classics from the base the sorbothane held them so tightly - and absolutely no bubbling / delamination to either the stand or the speaker after 14 months. Maybe the 'old' sorbothane is superior to 'newer' sorbothane? Got me, I just know I love the stuff ! When I buy my rear corner 340 SE surrounds in the Spring with my income tax return, I'll buy a new sheet of sorbothane from ES and give it a try to see if it has the same tackiness or not. Stay tuned.
Actually, someone mentioned the word "gummy" and that is a better term for how they feel / work.