In the Spyderco SharpMaker DVD, Sal says that the factory strives to get you a 15 degree edge. However, they are done by hand, so figure a 1 degree margin.
I worked w/that Byrd for over an hour with my Lansky using 15 deg. per side to no avail. Went to 20 & got somewhat of an edge. Not arm-hair shaving, but it'll cut semi-solid butter.
I guess the Chinese Spyderco's aren't up to par w/US made ones?