Hey Mike,
I don’t know if the PwnCNC spindle is to be considered differently than the other cheap chinese spindles. What I know, is that there is not only a difference between industrial spindles and VFDs like I bought and cheap chinese spindles and VFDs, but also between cheap chinese and expensive chinese spindles. So, …
As I have no experience with the PwnCNC spindle, I cannot say anything about how to best classify it.