We stated at the Poly and ate lunch at the Kona Cafe 3 or 4 days, mostly because it was convenient. It was quite good.
We also had room service for breakfast, which comes from the Kona, and it was standard breakfast fare and very well prepared. I had Tonga toast one morning, and I have to say, it's not what it used to be. It's much much smaller and didn't taste quite the same.
Dinner from room service was also quite good.
We never tried to go there for dinner because we had reservations other restaurants (CG, Citricos, YSH, Narcoossees).