Don't know how I missed this thread, but I love my mandolin. Buck gave it to me quite a few years ago. Heavy-duty stainless steel and sharp as a razor.
I initially used the guard but, for me, it didn't work. As a result I bought a butcher's Kevlar glove and found that works perfectly for me.
Yes, a food processor slices in a similar manner as a mandolin, but the mandolin slices more uniformly and thinner. And, as someone else also pointed out, I can create waffle slices with my mandolin.
Love my mandolin.
"As a girl I had zero interest in the stove." - Julia Child
This is real inspiration. Look what Julia became!