I've not owned the M21 style blade, but I've had the opportunity to play around with one for extended periods of time. I thought the handle/blade balance point was all wrong for a knife that size.
I have owned the M16, which had a better balance point (imho), but I got rid of it after not too long. Nothing really "wrong" with it, but not enough "right," either.
About 6 months ago, I bought the Lawman (v2.0). It's a super EDC, and it's a keeper.