I'm still kinda bummed against SFML for the BS way they treated 1.6 to 2.0 upgrade. Even with 1.6 still the official build, and with all the documentation and materials working for 1.6, they refused to fix a game breaking bug because he frankly didn't want to.
That left a pretty bitter taste in my mouth at least so far as actually relying on the product goes. I expect it to happen again too, as I believe the underlying core is pretty much fixed pipeline, meaning there is probably going to be another massive change in the future, which will again leave existing developers unsupported.
Other than this experience, and some serious attitude i've experienced towards beginners, it is a nice enough library.