It is exactly what it says it is, a burst of tone! Ruggedly built, easy to dial in, and it makes your tone gain about 200 lbs immediately. Not for use on every amp for every situation though. I ran it through my Mesa Mark V found it to be a little bit of overkill for classic rock, but awesome for Metal. However, running it through the Hughes & Kettner that I use at my church, it makes a great sounding amp sound FANTASTIC. The gain boost is subtle on higher gain amps, but you definitely notice the beef in your tone. On a cleaner channel amp, you notice the beefy tone and a nice little drive to your tone.