Watched it last night...overall, job well done!
I loved Jeff Buckley's album "Grace", and listened to him in the early 1990s..until his death in 1997. Even before his death, I found his life story fascinating, and I even went out the way to find some of his dad's music too (note: no youtube in 1990s!)...
So, after watching the movie, I guess the only (minor) criticism would be I believe it would be hard to follow the movie if you were not already aware of Jeff's (and Tim's) life stories..or, it would make it more difficult. My wife watched the movie with me, and I had to pause it and bring her up to speed on some of the "back story" so she could better understand things...
However, in all likelihood, I'm sure this film will primarily be viewed by Buckley fans....therefore, these folks are already attuned to the "back story"...
Otherwise, I thought the movie flowed very smoothly, and I particularly liked how Jeff's and Tim's lives were juxtaposed throughout the film.....job well done! Good film!