Installed in my ltd alexi ripped model. If your guitar only has a single volume control, beware that you can't control your guitars volume after install. All you can do is activate the boost and adjust the amount of boost, when it's turned off, the volume just stays at regular level without the boost regardless of where you turn the knob. ASIDE FROM THAT it's an awesome clean boost with more than you'll likely ever need. Brought my emg h2 alive And sounds close to an active pickup, though with more of the nuances of passive pickups still retained. It's different than a regular active pickup, in a really good way. Very nice alternative to using an OD pedal.

Installed it as an additional volume control, this is perhaps the only downside that it can't replace the existing volume and requires either installing as a new pot on a guitar or replacing the tone pot. Other than that, it's perfect, sounds great and doesn't color the sound at all (i.e. it doesn't turn your guitar sound into well-known EMG's "plastic" sound of their active pickups). I'd also prefer a push-push design, but it's not critical.

To clarify, I'm not using it with a valve amp, just a chain of pedals with Strymon Iridium and other drives. And I can get edge of breakup tones with it quite easily, while with high-gain tones it brings a lot of sustain/gain if needed.

And I totally disagree with a review saying it makes your guitar "sound like crap". I use it on a high-end guitar with custom-wound beautifully sounding single-coil pickups and I don't get any sound artifacts, it's almost too pristine.

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The other reviewers clearly are using cheap unresponsive gain. If you have a tube amp, or a good responsive od, it is amazing. It also gives you virtually unlimited sustain. Finally, when you have humbuckers with coil tap, it will help neutralize the signal loss, allowing you to enjoy your single coil sound without messing with your rig. This thing fixes so many issues and adds so so much to your sound.

I added this to a set of EMG Zakk Wylde pickups. I used the original guitars knob for a stealthy look. It was a snap to instal with the solder less connections and totally reversible. Functions great. Can add som dirt to a clean tone and some real sizzle to an already OD tone. If you're using a lot of distortion, it can almost act like a sustainer. Almost.
Overall, a fun gizmo. It can be completely turned off if you do not want to use it.
My guitar is a arch top BC Rich mockingbird with same control layout as a Les Paul. I got a knob from all parts that goes to 11 and all other knobs go to 10. Little hat tip to Spinal Tap ;)

Easy install.
Relatively inexpensive
No permanent mod to guitar
Does what it's supposed to.

I gave it a 4 because it's cool, but not "knock your socks off" cool.

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I just got on to grab another one of these for a different axe. Don't know how well this plays with other brand pick ups,but i installed this on a mexi Strat with an EMG Steve Lukather set of single coils and it's been a great tool for sound shaping. It's variable so you can dial in just a bit of beef on the clean sounds and really drive it over the top for solos. If you're going to put EMG's on your Strat,include this in the set. Rip off that extra tone knob,put this in and don't look back!

First off, don't be fooled. This thing is an absolute pain to install with passive pickups. It's terrible.

If you play with even a moderate amount of distortion, this knob WILL NOT CHANGE YOUR SOUND. I turn it up all the way and there is no discernible difference.

If you play mostly clean, this knob is fantastic. It gives great, variable gain boost that raises volume at low levels and gives your tone some nice bite at high levels.

this is like adding a cheep distortion to your guitar, is not a thu-bypass, so it changes the sound of your guitar, adding this afterburner will give you a boosted signal but your guitar will sound like crap, DO NOT WASTE YOUR MONEY

This is the 3rd guitar I've owned with an Afterburner.....the first guitar with passive pickups. What this bad mofo does is add an overdrive pedal into your guitar! An amazing little friend! The other 2 guitars I had them installed on, have EMG pickups.....they simply rule with humbuckers!!!