nope...i have both and prefer the mechanical discs as I can do a quick fix or adjustment on the trails...I carry an extra cable on those bakcountry trails as well
After having my front hydo fail last year and having brake fluid leak and burn my hands about 10km into the woods, I think that all of my future builds will be mechanical
As far as performance goes...both are Hayes, both have identical 6" rotors, and I can't really notice much difference between the two