I bought the boxed set and really loved the setting. The pronounciations was carp, but then I love history, ancient linguistics, in fact I didn't need a pronounciation guide, I already knew by looking at it that the elves, the sidhelien were the 'shee-len'. Which I loved as arcane practicing, non-divine elves (in fact I still see elves in all subsequent editions as that way...)
I liked the idea of the quintessential Gorgon as a singular monster, that may have spawned lesser gorgon, but was the first or original Gorgon, as a king and almost a god - which has a very ancient Greek feel to the idea.
After I complete my Kaidan setting development, followed by my Lands of Keld, ancient iron-age Celtic setting, I am very much interested in creating an ancient Greek campaign and would love to bring in the Birthright singular monsters that rule exotic lands around the main Greek peninsula and develop storylines similar to Clash of the Titans, Jason and the Argonauts, and the Odyssey, using the Birthright format as a means of doing that.
Even the wizards drawing power from the land is an interesting take to utilize.
I did think the Birthright setting was overly vanilla, which in comparison to FR and other settings was difficult to compete. That's why I think developing a non-vanilla setting like an ancient Greek world might better fit the Birthright concept and work for a game like Pathfinder.
But development of that won't be until next year, I'm afraid.
GP