The Atkins shakes in powder form do contain sugar alcohols now. THe new "spoon stirables" have sorbitol added. The canned ones I havn't seen sugar alcohols though.

I love designer whey and use it in much of my cooking. However it is a powder and I don't want to mess with the blender. The slim fast shakes are ready to drink, and low carb isn't available in powder at least here. I don't think they have asperteme, though they might, I'd have to look again.