Did you know that both Blackstone and Blademaster offer versions of the flat bottom v sharpening method? (I am sure there will be a lawsuit at some point, can't see how they both have patent pending on this)
If you go here http://www.blademaster.ca/pdfs/BFDFlatBottom.pdf
They explain that the arch is a perfect shape for supporting weight so the traditional sharpening lasts longer, while the FBV method gives you bite, longer glides, but the edge wears out faster.
I live in Southern California and I have finally found a shop that offers the Blademaster version of FBV. Can not wait to try it.