A little late, but someone commented on high vs. low inertia heads. The advantages of a high-inertia head are obvious, what does a low-inertia head give you? (My TMS has a low-inertia head and pretty poor auto characteristics).
Just cause it was brought up, the old Huey blades were tough as shit. Had a bud who went to shut a cabin door mid-flight and the door flew off, bounced off the blades and tumbled (lucky it didn't hit the tail). They were able to maintain controlled flight and land - to find a huge gash in the undersides of both blades, and it still was flying fine.
The verdict is still out on the new H-1 blades toughness. That being said, I still don't get how inertia would affect the blades hitting trees...but I guess that horse has been beat.