I saw it last night, too. It was a good movie in that it kind of... made Ray seem like a real man, flaws and all, rather than just an untouchable icon. Jamie Foxx was amazing - sometimes I felt like I was watching a documentary instead of a movie.
One thing: the movie is L-O-N-G, so you might want to think twice about drinking that extra-large diet Coke while you watch it!