I own Uji (ultra slim concealment tanto) as well as NRG non-magnetic (G-10 handle, G-10 blade, kydex sheath) and newt not only gets it right on the knives, he gets it right on the sheath. If you are looking for a solid knife for a great price, you will be fine here. No frills, nothing it does not need. Incidentally, why would one spend the money on Mad Dog when you could have HKR and a smaller back up knife for the same money?
Newt is currently making me a sheath for a BM Nimrod I picked up super cheap and I have asked for a Woo neck piece as well. I am willing to bet my life on his work, that in itself is a lovely testament. Jeff randall seems to think that the Rapid Deployment Machete is a first rate piece of outdoor gear. The handle he puts on his Airmobile Assault is a little small for the design, but otherwise I have nothing bad to say about the guy. Call him, he is a hoot to talk to, as well as being a genuinely nice guy. Tell him to be on the lookout for my Nimrod and request for a woo while you are at it.
Also for fun go look at Jeff Randall's jungle training site. Jeff is also great people and I will one day venture into the wilderness with him. To boot, my beloved has actually given her assent to such a project in the next couple years.