Hi, I bought a Sa-300 two month ago and played some duo gigs with it. (2 vox, 1 keyboad, 1 guitar) and it sound wonderful. Like a PA system, very wide and with deep bass. I love it! It is a bit noisy, when you use it at home but on gigs its ok. The reverb is very well and the feedback surpression system works very fine. I would buy it again and even gave up with my AER Domino amp!
More info at
http://www.roland.com/products/en/SA-300/index.html