Okay, I took my 21A camping last weekend and I have to say that I am impressed. Before I left, I sharpened it on my Sharpmaker with no problems. I used the knife for food prep and a lot of whittling - including several hot dog sticks and a rather large tripod that was used over the campfire for cooking. Blade stayed sharp all weekend.
The one thing that I noticed most was how comfortable the handle was after using it for an extended period of time. I had absolutely no hand fatigue. This comfort comes from the way the elk antler swells out on both sides which really fills up your hand. I wasn't sure if I would like the finger grooves at first (all looks and no function

), but they are designed very well and definately add to the security and comfort of the grip. Furthermore, the finger grooves are not too pointy on the bottom if you need to grip the knife with the edge up. As for the thumb rest, it is simply the best that I have ever used. It actually works! It is just sharp enough to grab your thumb without being too abrasive. It is also longer than most thumb rests which allows different thumb placement. Well done!
And finally, I like the way the knife fits in the sheath. It's snug, but the knife can be easily removed with one hand.
I guess after 70 years of being in business, these Ruana guys know what they are doing.