I am happy to answer this question because I have very strong opinions about it.
I would absolutely recommend trying GF CL. If you think Poly CL was amazing, you will think CL at the GF is to die for! We stayed at GF RPC in March 2010 and were completely awestruck. We then stayed at Poly CL in Dec 2010 and thought it was very nice for the price and would certainly return... but with that said, the GF CL is in a whole other league. It literally makes the Poly CL look shabby (as I said, we would stay at the Poly CL again... because there is a proportionate price difference from the GF). My kids loved the GF when they were there (8 and 10 at the time), and then loved the Poly, but are thrilled to be returning to GF CL on our next trip April 2012.
I also want to add that we are normal, regular, middle class people and did not feel as though the GF was the least bit stuffy. My kids are spirited and excitable and they felt very comfortable there, and I never once felt self-conscious about them being there. The staff was so gracious and made us all feel like a million bucks. It is extremely kid friendly, every bit as much as the Poly, with all the accompanying pool games and whatnot. And they also have table tennis for the kids and a hot tub for me, what's not to love?
Good luck with your decision. You have what my best friend calls a "high-class problem," lol!