What music are you playing and how loud is your band? I have an MB200 and have totally drowned out our drummer when going thru an uber-sensitive 2x12 or 2x15; conversely I did a gig with no PA support and a single 1x15 which was just not enough.
For jazz gigs, no problem; for rock gigs with no PA support, I'd say no.
My main head is the MB Fusion btw, which I bought after loving the MB200 so much