We stayed at Poly our last visit to Disney in 07, myself, DH, and 2 DS, and my parents. My parents are a tad nervous that they won't like the GF as much as the Poly. We had a great experience there but I have always wanted to stay at the GF and when we booked it was only like $100 or so more to stay at GF. Really couldn't pass this up.
We felt the same way about our July trip. As much as we love the Poly, we were not disappointed by the GF. It is a beautiful resort. I think I might like it more than the Poly! I never thought that I'd say that.