Not related to the eos-m camera necessarily but I have a comment/question...
I have a PNY pro-elite 32gb class 10 @ 35mb/s. it's good when 50%> full. When its even around 50% full, I find the card to slow down significantly. Very very annoying in many situations. Is that normal? Sandisk extremes better? And I think that it's better to shoot photos in smaller sized cards. Largest I'd use is 16gb. 8's are good! Now for videos, of course you'll need larger cards (32-64gb).
100D, EOS M, EF-M 18-55mm f3.5-5.6, EF-M 22mm f2, EF-S 18-55mm IS STM f3.5-5.6, EF 28mm f1.8 USM, EF-S 10-22mm f3.5-4.5 USM, EF-S 60mm f2.8 macro USM, EF 40mm f2.8 STM, EF 85mm f.18 USM, EF-S 55-250mm II f4-5.6 IS, EF 300mm F4 L IS USM, 430 EX II, kata 3n1 25pl, triggers, lighting, stands, remotes..