EMG AB

I paired this with an EMG81 in the bridge and an SA in the neck. Solder-less installation is easy for this but a PAIN for everything else (pickups, switches etc.) Also, EMG schematics are really poor. I read reviews that the AB thins the sound...Actually, I start to think the guys who reviewed it didn't install it properly. This thing boosts a clean tone straight to heavy overdrive, with some mid/bass top up so the sound gets a bit darker. So, when you boost a thick, tight gain tone, it just slays :) On full boost, you have sustain for ever in your leads. Otherwise, you can go for an "always-on" around 6-7 to have all the gain you ever wanted, and even setup your basic tone to be Midler. I didn't notice a jump up in noise ( I do have a gate always on for dirty tones) when activating the AB. Worth the money.

easy to install with emg's new clip in set up, not so easy to install if you have a set of pickups that require soldering but it can still be done.
i kitted out an old epiphone gothic explorer with an emg 81tw and this afterburner. the afterburner does add tones of gain but i ended up treating it like an overdrive pedal, set the amp to clean and push the natural distortion.
it is a great product that i enjoyed using but after a while i did remove it from the guitar as it wasnt quite tonally what i was after.
nothing against the product it just wasnt my thing.
was good to push lead lines and solos above the rest of the band mix too, worked really well for that