CNC Machine PROVerXL 6050 Plus - I read GRBL compliant but they add to it

I read this online - While SainSmart machines are compatible with open-source GRBL, it’s important to use the customized firmware provided by SainSmart for optimal functionality and ease of use .

What would be the best setting for MillMage as of the latest RC? Thanks in advance.

Probably just standard GRBL. I am guessing the added stuff for their spindles and homing but that should be transparent to the sender.

If you have issues please report back!