I've been using Code Igniter for my PHP projects, when I start them from the beginning. It is very nice framework, saves me a lot of work and let me have low level access if I need to do something special.
Code Igniter is also faster then similar frameworks by order of magnitude. I came across Yii framework which claims to be even faster and easier and prettier and whatever.
I never heard of it and I was wondering if someone used it in some real life project and have practical experience that he is willing to share.