Thankfully, the EF lens adapter is threaded for tripod. I would not trust to hold such weight only by the grip of the EOS-M. Just out of curiosity. You put on the scales to weigh their set with M-EOS, and DSLR and see how much weight saved?
Ha, Ha, Ha----Dear Sir, Mr. ajfotofilmagem.
You are right from the beginning , I am sick from the " GAS" = Gear Acquisition Syndrome, Ha, Ha, Ha, I have a wrong Thinking that The more equipment I have, The Better Photos that I can create---Ha, Ha, Ha---
WRONG , Poor Surapon= My skill of photography still the same as 30 years ago, BUT my EGO are Bigger---Ha, Ha, Ha.
Yes, Sir, After I spend a lot more Money for ADD ON equipment for EOS-M, the weight of the New EOS-M components Plus The M body = to my dear old Canon 1DS---Ha, Ha, Ha.---Not save any weight at all.
Have a great weekend, Sir, my dear Teacher.
PS, " I would not trust to hold such weight only by the grip of the EOS-M "---Not me either, If I use with 180 mm. macro, MP-E 65 mm. Macro, 70-200 mm, and 100-400 mm, I must use the Lens Tripods ring( I forget the Name of this Ring), to hold all the weight of the component.