As mentioned above, I am using it and it's literally the best thing I've ever done in my system second to a
real waveguide speaker (CD). That being said, if you're one to chase cables, caps and all that crap; this is likely not for you. If you chase that stuff and realize that you want science and to stop wasting your money, then this is for you!
Rather than regurgitate what I've already said about it, start with
this post and read from there.