If you're happy with what you have, stick with it. The headblade works great for some, but for alot of us, it's just too temperamental and results in alot of nicks and cuts. I say, "If it ain't broke....don't try to fix it". Just my 2 cents.
I have never used a HeadBlade either. iam comfortable with my Mach3 and the Fusion. I hear it's great, but I'm a creature of habit.