Most of the flavors are fat free, but they don't taste like it! :) This is by far the best softserve frozen yogurt I have ever had (fat free or not!).
They give you huge servings - bigger than they are supposed to be (unless you are unlucky enough to go when the manager is serving). I only know this because I have on occassion taken mine to go and weigh them for my diet (they have nutritional info which is great!) Getting this as a treat really encourages me to stay on track. But don't be fooled, it's so great that even when I am not on track I still go there ;)
They have a ton of flavors to choose from.
The place can get crowded at times, and you need one of the 2 low tables for a highchair to fit (my son loves it just as much as icecream). It can get dirty and the teenage girls who work there are usually busy flirting with their boyfriends who come see them at work. That doesn't really bother me because I LOVE the yogurt too much to worry about things like that.
The only downfall I find is that the price is a bit steep so I had to cut back on going there several times a week. If you sign up for their birthday club you get some nice coupons in your email though ;)