Found this while surfing the net by accident and liked the screw terminals immediately. Ordered it, was delivered in a few days, and was installed and up running within 2 hours on a new China system with a proprietary board that was running GRBL. Took a shot in the dark and it all worked out fine. No complaints from this customer. And will buy a couple of more for spares or new projects.
Just swapped over from Marlin to GRBL for an MPCNC that I just built. Setting this up and getting it to run literally only took minutes. Couldn't be happier since I am running dual X and Y axis. Definitely the best option I have come across if you want to run a Mega2560 with GRBL-Mega.