Having never played a binder (or even seen one on play) ..... failing your binding check, while it may make for some potentially interesting roleplaying situations (which in and of itself could be pretty cool), seems like it could become quite annoying.
This may be the "abused player" in me speaking, but I can totally see a DM using a failed binder check as an excuse to seriously fuck with you (+ collateral damage to the rest of the party) -- you know, for the lolz.
So, I take it that I am to believe that there's not really a need to be that kind of "DM-proofed"?
(I know -- "find a new DM", right? Sorry, non-fuck-with-you DMs are pretty slim pickings 'round here.)