I'm debating buying either the M5 or M6 with 18-150, 11-22 and possibly 22 prime (the 28 macro comes as a bonus), and 270EXII for an upcoming trip to Iceland and Ireland, rather than taking the 5DIII with 24-105, 16-35F4 and 600EX-RT, but have a few questions. For the M5 users, do you find the drag AF to be a very useful feature and. if so, how often do you use it and for what type of scene are you most likely to use it? For the M6 users, do you wish you had the same drag AF feature as the M5, or is moving the focus point sufficiently easy by other means? Do the B&W XS-Pro and F-Pro filters conflict with the lens hoods on the EF-M lenses and do the lens hoods reverse? Is the 270EXII fully compatible with both cameras? Finally, I don't see any reputable third party LP-E17 batteries available. Did Canon succeed in thwarting third party manufacturers from copying this battery?