Anybody Running a 4L60?

Does anybody here run a 4L60 behind a big or small block? What are your experiences with this swap? Considering this for my dart with a 440. I like the 4L60 because its compact and can take some serious power when built right. I have found a couple companies out there that build the bellhousings and I just happen to have a transmission already that i removed from a customers chevy pick up last year.