Excellent for battery powered gigs!
I am a gigging classical guitarist. I don't play large rooms - mostly smaller venues for receptions and parties and sometimes at outdoor events. I've learned, over the years, that it's in my best interest to keep my set up quick and easy. I used to bother with a PA speaker and a mixer and external mic. What a hassle. The set up that I've used for the past, two years is this: Sony ECM-44 lav mic clipped on to the edge of the soundhole (inside the guitar - treble side - pointing down toward the bridge) into a Fishman Pro-EQ Platinum preamp. From the Fishman I output to a Roland KC110 on a speaker stand (not a mic stand, as incorrectly stated in the product description).
The results are excellent. It's an all battery powered set up. The Fishman takes a 9v and the KC110 takes 8AA. The Sony lav mic takes 1AA. Not only is the sound clear and natural, the whole thing sets up and breaks down in less than 10 minutes. And because it's battery powered, I can set up wherever I'd like (in the shade, for instance, outdoors). I'm not tethered to an outlet.
With the AA batteries, the KC110 will output at 20 watts max. And so I keep the channel gain and master volume at 100% and control my volume from the Fishman preamp. With the unit up on a speaker stand, it is clearly audible above civilized chit-chat at well dressed affairs. It couldn't compete with a rowdy bar crowd, however. Use it accordingly. I use reverb sparingly. At about 25% applied, I find it to be pleasant sounding.
Bear in mind that you'll need a speaker stand with a 1 1/2" inch diameter. If you have a speaker stand with a 1 3/8" diameter you'll need an adapter.
Another nice feature of this unit is the mic input on Channel 1. It's not phantom powered and so you'll need to use a dynamic mic. I highly recommend the Shure PG48. It has an on/off switch and comes with an XLR-XLR cable. Useful for those situations when I need to make an announcement while playing.
Oh, yes: I almost forgot! The unit also has auxiliary inputs (RCA and mini) so that I can plug in my iPod to keep music going during breaks.
The whole shebang is only around 10lbs and has a solid feel (wooden cabinet) to it to with a metal grille in front. Tough stuff. As opposed to the BA330 which is 20lbs heavier and looks more fragile (and is $200 more - for what, exactly?).
This one's a winner, kids. Now go make some music!