The hone surface was a bit rougher than what a DMT 325 coarse leaves. Still tight enough to work ok, since surface finish (or even grooves) on the hone won't effect the actual cutting of the hone's grit much. I also finished up with really light pressure and alternating circular patterns.
I considered trueing up the Dubl Duck on my DMT D8C just for appearances sake, but I already have a second Duck that I lapped on the 325 as a control. I normally prefer the harder barber hones, like Swatys or my treasured Apart; but I'll use these Ducks for a while just to see if anything weird happens. I really want to see what the concrete will do to a Swaty now...
Maybe them old-timers (and woodworkers) ain't so crazy after all. :w
Edit: I used my concrete block with lots of plain water while lapping. I didn't try to wash all the slurry off the block at each rinse. The two Dubl Ducks I have sure do make a lot of slurry, on both lapping mediums.