I like the BM knives I own, although they are not the most carried or used of my knives.
According the BM's literature, the Lifesharp guarantee only applies to the plain, non-serrated blades or parts of the blades. I personally prefer to sharpen my own knives, or learn how to. And since the plain part of the blade is even easier to sharpen for me, I don't need the Lifesharp service.
Jim