Decent for a low price
This is a very good unit for the price (about CHF25 at purchase). Very effective at quelling acoustic feedback and warms up the sound of piezo pickups. Plus has three-band equalization and a variable mid frequency boost.
If you occasionally need to amplify an acoustic guitar but don't want to splash out much cash, this unit is more or less ideal. Will run on a 9V battery or the ubiquitous Boss PSA 9V style power supply. Plastic case is fairly robust too for a Behringer unit.