I was given a practice Rage head by a friend to fool around with.... must say it did fly very nicely. Although it rattles quite a bit. I suspect its just because its the practice blade.

From a design standpoint, they appear to be about as solid a make as any expandable around. Don't know how they couldn't open.

I've been on hunts and trailed deer shot by them... but have not flung one at an animal... so I'll just leave it at that... since I guess first hand observations don't really count as first hand shooting.