There are most definitely better connectors out there, but they are fine for the steppers. I still have one, actually 2 (male and female) at the VFD end of my spindle cable. Why 2?

The supplied VFD output connector was male. HUGELY DANGEROUS to have live connectors exposed like that! Live side of connectors must be female.
As I couldn't find a female panel mount socket, I opted to bring out the cable on a short lead with a female inline connector which mates with the male connector coming from spindle cable. I didn't want to wire it in directly cos I want to disconnect occasionally.

Anyway, after about an hour of constant (light) milling, the connector (inside) was no more than room temperature. I'm not worried.