DeWalt cordless chuck grabs the BC shaft with no issues. I would also venture to say that if you mill the shaft and have issues, the BC people might not be inclined to honor the warranty on the mill.
If I mill the shaft, and then have problems with it, I'll be the first one to say its my bad
Trust me, I've cooked enough things in my history to take the blame when I start walking outside the box..
You know, I smoked 3 Playstation 2s (when they were new, and cost $300 Ea) before I figured out my mod chip design. Never returned them, never asked for money back, its just the cost of curiosity.
Same with this. If it works right, out of the box? Better than great.. I don't have to play with anything.. I'll probably get a cheap drill, and make a custom base to hold it chucked onto the shaft.
If it slips, I'm gonna mill flats.. Never would I expect the BC team to honor my modifications..
But, if (lets say) the knurl "shrugs off" the rollers, or some other insane failure, unrelated to the milling of the flats, It sounds like the BC team understands where my tinkering ends, and their engineering begins.
I will never ask someone to take responsibility for my tinkering
-Jason