I've owned the MBX 4x10 cab for a few weeks and while it sounded ok and was a great value, It lacked in the high end department for me. I played it on couple gigs and didn't cut through for slap like i wanted. Decent low end for me, but might be lacking for most players. Returned it back to GC and surprising they had a GK Neo 4x10 used in the store for the same price as the MBX....

basically brand new looking!!! No signs or wear whatsoever!!! So although a great value for the working musician, i would opt something with better power handling. unless you're just using it for coffee house and acoustic gigs, get the 210MBE, IMO. 50 bucks more and twice the power handling. Can use your 3.0 combo together or detach the 3.0 and use the MBE alone.