I've done all that you mention with my M6 TTL. I kept the SF-20 for an easy tote fill/emergency flash. I have larger Metz rigs with the SCA adapters. They all work well and are predictable. I don't tend to use my RF gear in situations that I would be using the large flash units so I can't supply too much info there... Also, remember that the big rigs like the 76-MZ Metz units don't coordinate well as you run out of hands to hold, focus, shutter trip while trying to function with it all. My 54-MZ on a Stroboframe, oriented correctly works just okay as it is light enough to hold at awkward positions. I like wink light flashes and if pressed into quick duty, I would just mount the 54-MZ w/SCA right to the hot shoe and head out.... My SCA's are 3502 rigs, I believe (I'm not where the equipment is as I write this).