Well, I just came off the Zone and I'm back on Atkins, premaintence level. On the Zone, my carbs were 99g's per day, which is fine, if I don't cheat, and get my scheduled exercise in. However, I was not losing weight, but yo-yoing between 175 and 180 pounds. I went back to Atkins pre-maintenance a little over a week ago and I'm back down to 175.

If you intend to try the Zone, you need to be sure that you adjust your block intake according to your activity level. If you take a day off from exercise, you need to lower your blocks for the day. Alsom it requires diligence in watching your food intake.
I'm sure the diet works for many, but it's not for everyone. You need to do your own experimenting to find out.