Just a quick follow-up: I got my DOT knob yesterday (Thanks, Kelsey!)
In a word: cool. Two words? Retro-Cool. It's a great knob, with wonderful "embedded knurling" -- a smooth surface until you grip, then your fingers find the knurling.
It's perfectly balanced, no wobble, nicely machined.
And yes, it does help prevent the "pull up/down when turning" effect with other knobs. It makes the up/down motion of the DOT spinner very easy to control.
I like it. A lot.
Kevin