I am a performing guitarist, but a neophyte with guitar effects and effects units. I have rarely used effects in the past and never when performing, but found I needed more stage control over my EQ, so bought the AD8. This unit has a few major problems: 1. The tuner is not sensitive enough to pitch, so it is difficult to get an exact tune. 2. The unit burns through batteries, which gets expensive. 3. It doesn't come with a DCin, so I had to purchase that separately, and it imparts quite a nasty hum into our sound system. 4. There are too many effects dials that do the same thing without enough variation. In other words, they could have done the same thing with half the dials and reduced the overall size of the unit. That said, the effects sound good (except for the hum). 5. Like all Boss foot pedals, it's never sure the switch will happen when you step on it. 6. It is difficult to control feedback with this unit. 7. The memory isn't as large as I expected. You can only save four groups of settings, not forty. The EQ settings work well. But overall, not worth [$].