Yes, you should be using personas
Leisa Reichelt defends personas and explains how she uses them. She makes many good points, though I disagree that personas should represent edge-case users. Too often we spend too much time focused on edge cases, resulting in user experiences that are optimized for 5% of our audience rather than the 95% that represent typical uses.

Comments
hi Steve
thanks for the link.
actually, I also disagree with my wording :) I've updated my post and added a comment to clarify that I think that personas should include edge case requirements and behaviours. I don't think they should straight up represent 'edge case users' only... if that distinction is clear! :)
Posted by Leisa Reichelt on April 30, 2007 01:07 PM