Yep, there does appear to be a difference in opinion reagarding this stuff. In my little circle of hi-enders and manufacturers, people have pretty much had the same experience as me. That's why I put my opinion forth so brazenly.
But I also know others who use the stuff everywhere. As we all know there are many paths to audio nirvana.
I haven't tried it on video stuff yet, and I suspect it would be really good there.
ERS has a similar but stronger sonic effect as VPI bricks and Shakti Stones, with the same results.
I've seen the rave review of the BPT signature that Srajan wrote, and I am interested in the Z-sleeve, but you can't tell from the pictures whether you could fit it over a big Hubbel AC plug to get it on many high-end power cords.
A similar produt that I find works with no negative side-effects in may applications is the Audio Prism Wave Guide. I have two pairs and use them to good effect on ICs and digital cables (especially good on digital cables).