Stereophile - MF Supercharger article-add 550W/ch.

Have you read this article in september issue of Stereophile?
It says that Supercharger pumps up your system to 550W/ch. and leaves "no sonic signature" - "Like a chameleon".

It works like this - simply connect Supercharger between your power (or integrated) amp and speakers.You only need a new set of very short speaker cables.You get 550 W/ch.,better dynamics and bass, and everything else is the same.
It is claimed that it only increases dynamics, and doesn't change "the sound" of your original amplifier.

Without questioning Stereophile's knowledge (it is my favorite magazine) i just find it hard to believe this.
My question - has anyone actually tried adding supercharger to the SET based system,2-20 Watts of primary amp. power?
And can any owner of such SET system say it didn't damage (a bit at least) the magic and "the sound" of SET tubes?
I am aware that in article Scott 299B(18 W/ch.) amp was connected with Supercharger.
I want to hear from owners of SET based systems who have tried this.Or from other people who have some opinion on this subject.I just find this hard to believe.