I recently bought some Walker SST, based on reviews here on Audiogon and elsewhere. I paid about $100 total, including shipping. Last night I put the SST on a few select connections (speaker cable banana plugs, RCA interconnects between preamp and amp). Didn't notice much, but I suppose it sounded better. I read in the brochure that it needed 8 hours to break in.
Imagine my surprise when I turned my system on this morning! WOW! Not a night and day difference, but a definite change. There is an added clarity, kind of like I just cleaned my eyeglasses. I now understand what all those reviewers wrote about. Definitely the best $100 tweak I've ever had. (Aurios roller bearings were a "better" tweak, but they only add value in certain places in my system. I think the Walker SST can add value anywhere it is used.)
Time will tell if this tweak lasts for the long term, but for now I am quite impressed. Now I am trying to figure out how to clean and prep all the contacts in my system!
BTW, I have a pretty simple system.
Olive Musica music server
Arcam CD72 (modified) CD player
Dared SL-2000-A tube pre-amp
Onix SP3 tube amp
Gallo Ref 3.1 speakers