I have these (Castle rock/verde/grey) Classics in M41, they fit well but I recently tried a Sprint M42 and they where way too large in the heel, even after adjustment. The Sprint M41 were way too tight in the toes. For my Classic's, I leave the bunge cord open/loose or they push my big toe painfully into the cup (see below).
This is my first pair VFF and so far the fit is almost right. I have VERY wide feet and the ONLY issue I have with these are the Big Toe: it rests against the toe cup. If I tighten the bunge even alittle it pushes my big toe painfully into the cup and cuts into the top of my foot. Left open, no pain at all. All the other toes are fine, just the Big Toe. (I have a wide big toe ontop of the wide foot - curse me nine ways).
I highly recommend finding a local store that carries a good selection of styles & sizes. All of the Women's are too narrow (and I'm a female

) and I guessed right that all of the "higher" up the foot styles are too narrow for my Big Feet.
I'm seriously hoping the Classic Men's black/black don't run small. I just ordered a pair locally and would be very upset to have wasted their time (they carry all the other styles but CLASSIC in the store).