I have a subscription to Flying and I don't care too much for it (other than the pictures). Most of the articles seem ill tailored for the majority of GA pilots - "Choices: Whether to buy an older King Air, or a new Pilatus" They work on the assumption that everyone has hundreds of thousands of dollars lying around to update or upgrade their aircraft.
Les Asbend writes a column for them - he's an American CA - it's pretty good, he just talks about stuff he experiences on the line. Richard Collins comes off as pretty arrogant, though - God's gift to aviation. I just wish there more in there on flying tips - and more accident analysis. I guess that's what AOPA Flight Training is good for, if you can fight through pages and pages of ads for academies.