We've been to Cincinnati many times but we had somehow never visited Boca until recently. With the exception of the Tuna Tartare which we sent back (we found it bland) everything that we ate was truly exceptional. The fish (we ordered halibut and sea bass) was as moist and delicious as you could ever imagine and all of the desserts were excellent. I'd also recommend the shell pasta with porcini mushrooms which was out of this world. The wine list is extensive, with options at pretty much every price point, and service was first class.
Be aware, however, that all of this comes at a price. There is no a la carte menu. The menu is either 2 or 3 courses, plus dessert, for a fixed (and not small) price. Our bill for 4 people, including a modest bottle of wine, exceeded $400.
That said, for a special dinner it's well worth it. Highly recommended.