I got my large yesterday, but it turned out to be too small. Sent it back for an x-large. I hope it isn't too big. My head measurement was between the two, but closer to the large. I like Revzilla and the price was right, but there is no substitute for trying a helmet on in person.
"I have approximate answers and possible beliefs and different degrees of certainty about different things, but I am not absolutely sure about anything." Richard Feynman, Cal Tech Scientist