I expected to see a few birds and was really surprised at just how many I actually saw! There were well over twenty raptors at one viewing spot alone! The majority of birds were very far, so my 70-200mm, even with a 1/4x extender, was not the best lens. Oh to have an extra $13K for a 600mm lens! I can't even imagine...
I'm also going to try and learn more about The Ferry Bluff Eagle Council, the organization that monitors the birds. I'd bet there are some interesting folks involved.