Macs are a small minority of the total computer market. They're a huge percentage of the trailing edge, however--the tech-savvy people who are willing to try a new service like Dropbox or Syncplicity.
I agree with your first paragraph but would note that I think you're shooting for "Leading edge" rather than "trailing edge."
I agree with your first paragraph but would note that I think you're shooting for "Leading edge" rather than "trailing edge."