I received my FD to EOS M adaptor today and I've been playing with a FD 50mm 1.4 today, using the focus peaking on ML is so helpful when focusing. I'm still figuring out ML but I mainly installed it for the overlays. A little tip - switch to Monochrome picture style when using focus peaking to see the red dots easier.
What lenses you using with yours? Native M ones or something more exotic?
I use the EF-M 22/2 90% of the time, really a terrific little lens! I plan to buy a EF-M 18-55 at some point. Nothing exotic, but I also use my EF 50 1.4, 85 1.8 and 24-70 2.8 II with the M. The 50 1.4 makes a nice portrait lens on the M, but locking AF can be a challenge at times, I normally just manually focus it.
Thanks for the tip on picture style, I have been experimenting with focus peaking this morning but struggled to see the dots in bright light.