Yogurt Spoon is great. It's a full 30 minute walk from my house and I have been known to trek out there when I'm in the mood for yogurt. I do this despite the fact that I can check into Menchies, Cefiore, Mon Berri AND YoYo's from my house. It's that good.
I would say the yogurt here is more like Menchies in that it's more sugary than creamy. They do have a few unique flavours though, that I haven't seen elsewhere (pink grapefruit!). Their toppings bar is basically what would happen if YoYo's and Menchies' respective toppings bars got together and had a baby bar. It's got a great mix of fresh fruit, cereals and candies. No stone is left unturned but they don't over-do the health side (like YoYo's tends to) and it's not a complete sweet shop (like Menchies).
This is self-serve too and, if I remember correctly, slightly cheaper than the other two places (I think Menchies is 49c per oz and in the middle of the three pricewise).
The staff are also insanely nice here. On more than two occasions I've shown up at 10:55, five minutes before closing, and they've not batted an eye. No, "We're closing in five minutes so be fast!" or locking the door behind me. A few times I've actually ended up eating in because by the time I was done creating my order, the door has still been open and customers still walking in (at 11:05) to get froyo. One night we stayed until EVERYONE had left and didn't leave until just after midnight. It seems they really won't close as long as there's people with a hankering for froyo. That's what makes this place a four star store!!
Definitely a must try.