I have been using this pedal for about a month now, and I love it. It does just what I bought it for, to cleanly cut through when I solo. It doesn't change the tone of my 335. If I had only one pedal to use, it would be this one. I am blasting thru every gig.

This pedal does not 'make your guitar louder' when activated. At least the one I got doesn't. When activated on a clean channel, all the way 'down' - no change, turn up the knob, it adds distortion??? Not exactly what the product claims it does. Maybe mine's broke. ??

This little pedal kills. It is awesome for boosting your signal. I use it as a boost for solo's on my drive channel. It gives me extra gain and a little more volume to sing right over the other instruments in my band. It gives your guitar great sustain without unwanted noise. This thing is the best in its class.

I've used the MXR M-133 micro amp for 4 years now. My pedalboard has changed significantly in 4 years, but the Micro-amp has always had a place on it. I used to use it for a boost pedal but as my pedal board has grown I now use it as a signal boost. I have a moderate signal chain, MXR Super Comp, Fulltone GT-500 overdrive, an old 1990's Tech 21 XXL overdrive, Voodoo Labs Super Fuzz, MXR Micro-amp, MXR Phase 90, BBE Soul Vibe, EH Stereo Electric Mistress, TC Electronics Nova ND-1 Delay and NR-1 Reverb. The signal, stereo left and right goes into two Epiphone Valve Jr. heads which feed two EarCandy single 12 cabinets with Peavey Scorpion speakers. The Micro-amp adds nothing to the signal, just a nice even clean boost. I've never had a problem with the pedal. It's one of the best buys I've ever made. I'll be buying another soon for another pedalboard I'm putting together.

I have this pedal at the beginning of my pedal chain and it is a must for anyone mixing old and new pedals together. I have a humbucker equipt guitar I play through a mid 60's Fender Tremolux and in my pedal chain I have a Vox wah pedal. It is an excellent sounding wah pedal when its on, but it absolutely kills your amp's tone when its off; the Micro Amp pedal is excellent for bringing the brightness, lost in the chain, back to my amp. I leave it on all the time. For boosting I use a Boss eq.