The only size available is 205/50/15. I have an email to Hankook which i'm still waiting on a reply. I'm trying to nail down the release dates of the other sizes. But the reviews have been pretty good thus far on them. Very comparable to the RA-1's, could be better even.
Yes Vilven Tire is the ONLY supplier and at this time, Hankook is not even considering other suppliers at this time. They said they might reconsider in a year or so. We'll see. I'll post when they reply to my email.. should be this week.