The 700RbII has a well-deserved reputation as a reliable workhorse amp also. Mine was a rock, and I would feel safer going without a backup head with the 700rbII than I would with the MB500.
I also appreciated the bi-amp features on the 700rbII. Overall the amp sounded great and had well laid out EQ section.
Agreed 100% with all of the above...
- georgestrings