I've tried Jenny Craig, Nutrisystem and Freshology. For me Nutrisystem was almost inedible but it was very cheap cost-wise. Jenny Craig was OK - some food was good and some I didn't care for. Freshology has the best tasting food by far (and healthiest) but it is VERY expensive. Sometimes they have good "special deals" and I buy a 4-6 week program.
A guy where I work is on Diet-to-Go and he likes it for the most part. I'm wondering about the Fresh Diet which I've gotten a couple of brochures about. I may try that when my current Freshology program stops.