++ajt (for a good question) and ++Trimbach!!

You're right, Trimbach. Users make lousy testers. This is generally because their perspective tends more toward the concrete results they seek, rather than the (what almost certainly appears to them to be) picayune level of detail necessary to adequately test an application (e.g., "Why would anyone want to do THAT?!?").

Of course, the other side of that coin is, "Why doesn't XYZ work," where XYZ is some completely unanticipated sequence that no one, during development, bothered to mention that they sometimes do ("Oh, that'll NEVER happen ...(time passes)... Oh, except when ...").

Nothing replaces solid regression testing, unfortunately, and without another pair of eyes (presumably connected to some form of brain, one would hope) it's difficult to code for users' making choices one didn't anticipate them making.

Good luck to you.

dmm