I'm a beginner guitarist, though a life-long musician. This amp came highly recommended to me and I just used it in my first outing with my acoustic this weekend. A fantastic amp! Probably all I'll ever need, as if I'm in any setting too large for this, I'd probably just plug into the house system anyway. The only negative I can come up with the unit is that it doesn't directly support "rechargeable" batteries. As available/common as rechargeable options are these days, I'm surprised they designed around disposable. Of course the option of using rechargeable "AA" batteries is there, and that's probably what I'll do longer term. The price point of buying an open-box unit made it irresistible, since I knew this was what I wanted. The unit was truly "good as new".