I bought in addition to a couple of 57-7/66-7 and replacement of PA2 mounted on 81-7.
As I already said in my review of the 57-H, The pickups are already better than the old ranges (all microphones combined EMG).

It is therefore a push button / pull: off position and low assets in high position - there is then only the throttle.

I have a Dual-BlackStar Ht, the crunch button is inaccessible from the pedals.
There are three days I will have still not been able to reach pedal position, which is a pity.
Today is a different story, since AB is able to get me almost the same sound (hair ass baby fly around).

The Booster is a great clean channel to make cruncher on the other hand it does not bring about a big distortion.
The big plus compared to my old PA2, is that you can adjust the gain, and saw my new pickups, this is not trivial.
On my old 81-7, even clean, we did not feel a slight difference.

He takes the place of the Tone knob on my guitar and really a great job to my side of 57-7 and 66-7.

I put it a 10 because for me it is perfect.