They are the perfect guilty pleasure. The food is low cal (compared to Ice Cream), the prices are very reasonable, and the options, choices, selection is amazing! Whats the catch you ask? It is SELF SERVE!
You pick the yogurt, you add the toppings, they weigh it and you pay. We did a family of three (and my wife heaped it on) for less than $9.00.
They do have a TV, but it is always tuned to Disney or Nicelodeon - That's my only complaint.