I now have a 12.7 VPI, which is a great arm, as well as shorter arms. My own opinion is that good arms of any length have more performance in them than most ever get out of them. The 12" arms require different length arm boards or even different tables than shorter ones, something to be kept in mind. Not all tables will accommodate them. I like the longer arms but I would not make it the sole or even the most important criteria in choosing an arm.
