Is Hershey's frozen yogurt TRULY good for you?

A Hershey's ice cream store just opened up by my house. Instead of getting ice cream there I got frozen yogurt. This tastes just like ice cream, but the sign said it was only 8 calories (per serving). It also said diabetics and people who are lactose intolerant can eat this (supposedly) all natural frozen yogurt. I am just curious, is this another food that is falsely advertised? Is there anything that would make it not healthy (like does it have to much sugar or something)? What I am saying is, the yogurt is SO good and yet they SAY it is so healthy...whats the catch?