Quality wise (and service-wise), I have never been disappointed by William Poll, but it is so expensive that it makes your head spin.
If you lead a lifestyle that involves a carefree attitude about money, as many people on the upper east side do, then it's for you. But if you're on a budget, steer clear. You can still eat very well in this town without cleaning out your bank account at this place.
Pros: Top notch food
Cons: Out of sight prices