I have become a YoYo's addict. First off, they have a loyalty card. I need to get on this. Second, you get your fro-yo FREE on your birthday. Everything is by weight, so if you really load that sucker up you can get a $10 thing of frozen yogurt for free.
I really enjoy all their options for toppings and the staff are super nice. They have a cute patio that is spacious (although I haven't tried it yet) and the store is really neat and tidy. Let's face it, anything that is "serve yourself" can turn into a complete pig-pen relatively quickly.
Their green tea is good but I suggest doing the classic vanilla or chocolate. It allows for a huge assortment of toppings. With green tea you're kind of limited to fruit items.
The one downside is they are super expensive and by weight. My first time coming I was totally unaware it was by weight and ended up with a $10 vat of yogurt with a bagillion toppings, to the point where I nearly threw up. My boss was paying, and my yogurt came to twice that of everyone else's order....combined! So beware, it can add up quickly if you go cray-cray with toppings.
Much love for Yoyo's!