I like the Kill devil and think it is very practical. I want the Rattle hawk for a few specific reasons. It looks like a great alternative entry tool. I can pry with it. Chop through a wall and the extended beard should make going through drywall much easier.
The biggest issue I see is the top is sharpened. That makes it a finger chopper. I will probably grind down most of the top blade so I can use it for my intended purposes.
I had thought about leaving it and making a double thick Kydex head cover. But i think thats inviting disaster. I really have a thing about keeping all of my appendages attached.