I just started New Lifestyles which is the WS products sold through a different retailer. I didn't research enough and actually, I'm switching over to the WS products through Diet Direct to save some money (they also have a little more variety) but will probably stick to the NLS schedule- which is less carbs than WS's actual plan (I think WS allows you a serving of fruit and a serving of starch a day, NLS is just 7 supplements and a lean and green meal).
I have thyroid issues and a lot (but not all) of the WS products are whey-based rather than soy-based.
I can tell you that I do really like it. I was fully prepared to have to hold my nose through most of the food and be hungry most of the time, but I have been pleasantly surprised. Yah, it's "diet" food, but I ordered a pretty big variety and so far none of it has been inedible, though some stuff is definitely better than others, and there is a bit of a learning curve on how to prepare it. One of the other things I like is that NLS/WS allows you to eat more often during the day- 7 supplements as opposed to MF's 5. 7 is actually a lot- it's been hard for me to eat them all everyday. I'm sure it's reflected in the calorie/carb count difference between MS/WS, but honestly, if I only get in 6, I'd rather feel like I was UNDER my limit than if I was on MF and was so hungry I ate 6 and was OVER my limit. That's just my personal psychological makeup, though- a calorie's a calorie!
NLS/WS does suggest that you take a multi-vitamin every day, and MF doesn't because they have more micro-nutrients in their food. For me, this didn't really matter one way or another- it was still cheaper for me to do NLS/WS and buy vitamins than to do MF. I also did start taking a fiber supplement, though I probably would've done that on MF, too, just because of how much processed food you're eating on either diet.
I know people on here are really pretty jazzed about whatever one they're on, though, which says to me that both are really great programs and whichever way you go, congrats!