If anyone is interested, the MB45 is today's Musician's Friend Stupid Deal of the Day.
I picked one up to use for a few things and it looks to be a great tool. I have a GK MBF 800 & Peavey IPR 2K so I have plenty of power for my louder bass gigs. The things I think (hope)this will excel at:
1) Practice tool with aux in & headphone out
2)Power amp for low volume in a worship band setting w/ house 12" speaker. Just bring my pedal board & bass.
3) Amp for my Tech 21 RK5 flyrig into small guitar cab.
And for $100 bucks I felt it was worth a shot.