I usually go to one of the other millions of yogurt shops in the Anenx but was actually pleasantly surprised at YoYos. I think it's better.
The flavour options are way more and they change frequently, they even make you feel not so bad by offering low-fat, no-fat options, which is nice.
I made the mistake the first time of adding lots of toppings and it was damn expensive, the second time I went on Mother's Day, it was free for Mother's which I thought was cute and mine was less than $4 (no toppings but still great).
They were friendly and best of all there is a cute little patio!