Wait a minute cpl593h, you see the whole Trigun series, and 1 volume of Cowboy Bebop and instantly dismiss CB as not having substance? At least reserve judgement till you have seen the whole series, not 5 episodes out of 26.
The music for CB is awesome, but I love the characters just as much, especially Ed. Though the story mainly focuses on Spike, there are episodes devoted to Ed, Jet, and Faye. I just wish that there were more episodes. After seeing the end of it, it just left me wanting more. For a 26 episode series, I thought the characters were pretty well developed. Defnitely plenty of substance there.
--Ben