Own the books. Haven't played it yet, but I don't particularly care to.
I appreciate a lot of the good ideas that went into the design, and I'd like to see them implemented into a 3.X structure... but I really dislike how restrictive the new class system has become, especially given the lack of real multiclassing options.
Maybe it's my penchant for weird-ass characters, but I can't think of a single 3e character of mine that I could play in 4e-- and even with new classes in later products, I do not see a good chance of ever being able to.