When I tried the Canon EOS-M I found its handling to be very awkward. Richard Franiec makes grips for a variety of cameras (such as a grip for the Sony RX100) and now is offering one for the Canon EOS-M, which ought to help that camera handle better.
One of the most frequent complaints in reviews and in feedback from users was its less-than-stellar handling characteristics, especially with the heavier EF/EF-S lenses mounted via EF-EOS M adapter. The custom grip for the EOS M was designed to address this problem and ensure greater comfort and safer handling of the camera.
The grips are individually CNC machined from aircraft-grade aluminum alloy, glass-bead blasted, and anodized to closely match the camera’s body finish. A proven VHB (Very High Bond) transfer tape is then applied that allows the photographer to securely attach the grip to the camera body. The grip won’t let go until you want it to, but if that time ever comes, it can be removed using dental floss without damaging the camera or grip.
A limited number of Canon EOS M grips will be available in the second half of November 2013 for $34.95 plus shipping. Preorders are being accepted now.