We tried Yak and Yeti twice, once when it first opened and once last September. We were not impressed and we did not enjoy the food there. We went back the second time thinking that maybe it got better since it had just opened the first time we went and our kids need rice every couple of days (we're Asian). The service and food did not improve, in our opinion. I think Yak and Yeti is one of those love it or hate it type places.
Just so that you have an idea, I am also not a fan of PF Chang.