Suomy's run one size smaller than most others. You definitely want to try one on first to make certain that it fits well. The finish on them are second-to-none and I am very happy with mine. Only problem is the coating on the iridium visor peals off if it gets well. Obviously, that is not a problem on the smoked and clear visors.
Switching visors is a pain on the Suomys. Similar to Arai.