For me personally, basically zero.
For some the fee charged to do deposits that are reimbursed as commission credits bothers some but to me it is absolutely no big deal.
Sometimes I would like to see more money being displayed to take advantage of...............but even using the secondary best numbers is usually better than all other books.
Said it for months now, MB is by far and away my #1 book at the present time and has been for 4+ months and would be surprised if this did not continue for sometime.
-FH-