Was able to get a decent deal on one of these thru GC. Beautifully crafted little amp, with a lot of nice touches - input mute, aux input with level control, headphone out. I bought this for jams with my acoustic band - very light percussion, two acoustic guitars that are plugged in but very moderate levels. We spent several days recording recently, so I brought the D4 along to check it out. I've read so many positive reviews of the D4 for such a musical situation, jazz gigs, and other acoustic settings. Sure I was skeptical about having just two 4" speakers, but there's that passive bass radiator... Well, apparently this amp works for a lot of folks, but definitely not for me. I compared it side-by with an Ampeg ba10 (10" speaker, 40 watts). The D4 has a great tone, but just doesn't get deep enough and loud enough. I was using the power supply btw, not a battery. When I turned up enough to get satisfying boodie from the little package, it started farting out on louder notes. This was not a loud setting; the little 40watt Ampeg had no trouble getting those sweet, low notes to support the other musicians. I ended up using the D4 together with the ba10, made for a real nice sound with lots of definition. I'm sure that I'll get some use out of it for practicing and maybe as a travel amp, but no way I would ever bring this to a gig except as a kind of midrange extension speaker if that was needed. Obviously YMMV, just offering my experience for anyone that is interested.