Indeed weld itself even in the guitar as a push-pull knob that will replace one of the tone knobs.
Active effect, remember to leave room for the 9 V battery

UTILIZATION

The Doc is poverty and relates only to the classic Start, then it is a tool that is also very useful on Les Paul, PRS, or in my case ... Randy Rhoads.
In short, know how to handle the soldering iron is essential, and a reorganization of all the jumble of knobs and son that has electronics in its cavity may be necessary.
Lazy, refrain

SOUND QUALITY

The effect is very effective.
As soon as we started, it enlarges our sonic palette yet!
The Bosst march to perfection, allowing the choice of mute the sound a little bias in the bass, or just plain have an impressive boost in the midrange to move from a rhythmic sound a solo sound richer and more mixable.

On a stratum, it must be absolutely perfect, but very strangely on my Randy Rhoads If granted, the result is excellent!

OVERALL OPINION

The value for money is, as always with Guitarfetish, crazy!
I do not know what makes the "real" boost Clapton to be found in his signature Stratocaster, but it should not be far away.
The sounds are even more varied, and the Jazzman heaviest metal through all the other rockers, everybody will find his account.