I have found two models of Shapton hones... one of which is much more expensive than the other (the "professional series"). Is there really a big difference between the two? Both families of hones come in the full range of grits. Just curious.

http://thejapanwoodworker.com/dept.asp?dept_id=13253
http://thejapanwoodworker.com/dept.asp?dept_id=13238

thanks
Andrew