Good value for price
It's not perfect but it does get the job done. Fortunately, the pluses outweigh the minuses.
First off, a major plus is separate 5-band graphic EQs for each channel. That is better than the 3-band EQs being offered by every other acoustic amp in this price range. The EQs also feature Behringer's FBQ function which automatically pinpoints problem frequencies prior to feeding back so the user can reduce the specific band effected.
I also appreciate the two-way footswitch included with the amp for switching FX on/off. It's not really necessary since I don't plan to use the onboard FX, but it's a nice touch that no other manufacturer offers.
It has a great sound--very clean. And the EQ helps eliminate some of the midrange "quack" that piezo pickups are noted for.
That said, there are a few deficiencies I'd like to note.
First off, there is no master volume--simply individual channel volumes. It could be that Behringer thought adding a second gain stage would be too noisy, but if the individual channel volume controls were passive while the master volume was on an active gain stage, the noise problem could be eliminated and allow the user to use the individual channel gains for purposes of balancing only.
The second deficiency is that this unit has no DI output allowing the user to run a signal from the amp to a soundboard.
Finally, no headphone output. This would be nice for silent practicing.
It should be noted that these amps do not have enough gain if one's guitar has a passive pickup. So if your guitar is not pre-amped. It you would get more out of the amp by running the guitar signal through an active pre-amp. I've tried this unit using a guitar with a Mighty Mite passive pickup and run the signal through a Behringer ADI-21 with very good results.