Nathan,
My MXC is only the second one I had seen. The first being in 1976 when I worked for Curnutt Shocks.
In my research of these bikes, I think there are 3 1/2 in Australia, 2 in South Africa, and probably somewhere around 15-20 here in the states. I saw somewhere recently that a person over here found 2 almost complete bikes in the last month or two. I know of 5 in California, 5 in Georgia owned by one individual, a guy who has one in Florida that he bought new, and a few sprinkled about the States. Very few parts are even available over here. I was lucky mine had all the major parts still intact, and it was living 20 minutes from my house.
The ones I know of:
1. Bill's one (now in NZ).
2. One Holeshot Buddy had for sale about 18 months ago.
3. My old incomplete one that I sold to TT5 Matt.
Tim754 said he knew of a good one in rural Vic, but he hadn't seen it for several years (and that was a few years ago), so it doesn't count as a confirmed bike (yet?).
I rode Bill's one at CD6. Great bike, but my YZ-X would eat it: Better suspension and more grunt everywhere makes up for the slightly heavier feel of the X. Might be different for a starving jockey like Bill, but for us adults
, the X (and a YZ-D) is the better thing.
That said, I'd prefer an MX-C over a YZ-C - something about marketing triumphing over engineering...