help! if you were to rank the flexibility of the racket from the "stiffest" to the "most flexible", what will it be? i'm just guessing, please correct me if i'm wrong. extra stiff stiff medium stiff (or is medium stiff "stiffer" than stiff) flexible medium flexible extra flexible very (or ultra) flexible (i think some brands have this) another thing, is the flex rating the same for all brands? i have read in some forums that the stiff in yonex is medium flex for other brands. can someone enlighten me? i am particularly interested in the head metallix 10,000 tour. it says it's medium stiff.