Anyone buy ballscrews from Azteca12345 on ebay?

I've been looking at the ball screws this person is selling on eBay.
They appear to be pretty nice units, but this seller is not willing to
do anything in the way of verifying pitch, measuring anything, etc.
Has anyone here bought screws from this seller?
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=2513571312&category=12584
is one example. I've been to the Kuroda web site and cannot find any way
to search for specific data based on the part number listed in the
auction. With two nuts, this can be preloaded good enough for what I'm
doing.

Thanks,

Jon