Don,
Yes, it's good enough. The advantages that I miss in the upgraded models are not a huge factor, and the audience will probably never really know which one I use. If I had more specific needs, I'd bring the extra gear, but for my very low-key shows ... it's just not as important to me as it once was. The 900 is a dream machine for my world. The only thing I'd like to add would be a guitar/aux input and an eq on the MP3 playback section. That'd be nice.