I have an RTD-51 protein shake for breakfast. It's 240 calories (the same as the bagel I WAS having for breakfast) but only 5g net carbs, and has 51g protein, and only 1g of fat. It's also got a load of vitamins and stuff. I think it has really helped me get over my "lack of protein" plateau, and has got me making gains in strength doing weight-training again. It says on the bottom "Do not use for weight reduction" which I find odd... unless they mean "This stuff isn't slimfast - eat real food too." (But if you look at slimfast, it's all sugar and leaves you hungry).
I just use it as a replacement for breakfast. I'm a horrible breakfast eater anyway, as I not only don't know where to start, but I'm allergic to eggs, toast is too much sugar, I'm not a breakfast eater and... I just can't find any quality breakfast food that's easy to grab and go. So I figured I'd try this. They're very yummy, and so far, it hasn't hurt (but perhaps helped) my weight-loss by filling out all the vitamins, protein, and nutrients I wasn't getting on my own.
--Janis