<< Sweet 'n Low certainly isn't good for you, considering it has a cancer warning on the package. :Q >>
Sacharin (Sweet & Low) was recently found to NOT cause cancer, and the packets no longer are required to carry that warning. Get new packets of anything with sacharin and you'll see the warning is gone.
However, as mentioned aspertame (Nutrasweet) is supposedly the bad stuff now. Causes short term memory loss, vision loss, etc. in the long run, but not 100% conclusive. Equal, Diet Coke, anything with Nutrasweet is the stuff to "avoid" if you are into worrying about your health.