Air-mailing is always hazardous(watch the bounce!). I prefer control over everything I send down. Rigging enables larger pieces, less time on the spar, and less sawing in the tree. Yes, a chainsaw in a tree is fundamentally a bad idea, much safer to buck wood on the ground where you can be on you're feet and able to move quickly if need be. I have well over 5000 hrs. of saw use under my belt and I have never found it to be "fun". Don't get complacent, have respect for your saw, and no hot-doggin' in a tree. As for the groundsies, I find that they pay much closer attention when they are involved in the rigging process, I don't want anyone walking blindly into my drop-zone. Control reduces risk, increasing everyones chance of going home at night.