The TTRegs were Differentially Treated: Spring Tempered body with 59-61 Rc edge. And a Full Flat grind.

The other Regs were Through Hardened at a lower Rc.

The heat treat and blade geometry makes a huge difference and puts the TTRegs in first place in my book.

The DeReg came about do to some complaints about the top guard (both getting in the way and being damaged during use. Plus some people didn't like the looks of the top guard). Very nice of Dan to accommodate all the dogs.

I gotta say the Regulator handles really help dampen the blow from chopping (my 1311 handles leave bees in my hand after extended use) the Regulator handles also allow for more chopping holds.