I found using all-in-one stereo amps/speakers, like the Traynor K4, quite unsatisfactory for optimum stereo separation.

I think the length of throw of the speakers in the 330 would be what I'd be concerned about if it was to be used as a PA.

The K4 was loud, but the high end dropped off rather severely when you listened at a fair distance, not to mention the stereo effect.

It's hard to beat two separate speakers for stereo, but if you don't mind the loss of that effect at a much shorter distance than the former, it would certainly be much better than a single mono amp for reproducing a stereo keyboard.

Only 30 watts a side means you'll be pushing it quite hard at larger venues...consider two Roland Cube CM-30's and you'll get an idea how loud it is.

Ian