I just got a Smoothieboard Beta!
It looks great, but when I came to selecting connectors I ran into trouble. The big power connectors are simply too small for heavy duty heatbed wiring. There was one large Phoenix connector supplied which looked like it would be for big mosfet power, but doesn't fit there.
The connectors for motors, endstop, thermistors are ok, although the space is not quite enough for Molex KK connectors in places. 0.1" or the 3.5mm phoenix for the motors is a reasonable setup. But the multiple footprints on the power connectors doesn't work for me. They take up board space but don't allow for the connectors I actually want to use. The 5mm Phoenix are pretty standard and capable of high current and big wires.
I have a few other niggles as well, but really the power connectors are a no go for me. I realize this is a beta and may change. Is it just me, or do others have the same issues?