When I researched diets, the first one I considered was Medifast. I finally went with IP, because of the vegetables. On Medifast, if I remember correctly, you get 1 1/2 cups a day with your real protein meal. On IP you get 4 cups and unlimited lettuce. For me, this is the key, as I wanted to get in the habit of consuming large amounts of vegetables. It's worked. My tasted buds have changed, and the veggies are my favorite part of the day.
I've had huge success with this diet too. Not saying you won't with Medifast, but I'm totally satisfied with my weight loss and more importantly with the way I'm eating now. I love my greens.