I've bought and read all of them except for the volume four. Good stuff in my opinion.
If you're interested in Flight, you might want to check out Image's other anthologies, Afterworks Vol. 1 and 2, 24/7 Vol. 1 and 2, Popgun Vol. 1, and the Belle and Sebastin one. I've read all of them except the B'nS and 24/7 Vol. 2 and they're all really good.