Can't much comment on the YSS shocks, beyond the fact that  they seem kinda pricey.
Lots of folks here are running Hagons, which have an excellent performance & durability record, and should cost less than these YSS.
Check out  http://www.davequinnmotorcycles.com/cgi-bin/webc/home.html  for details, prices, etc. [smiley=thumbup.gif]