When I started up with WISH I began w/ The Zone - I lost a little, but I was only on it for a week on my way down to Atkins. I found it harder to follow. It is a good and balanced diet and models the way we all should be eating all of the time (think Atkins on Maintenance) but for the long haul, it took too much think time and effort for me.
That said, do it if it works for you! It's a good plan.
Karyn