(Note: Will add pics soon)
So my experience with the EOS M may be different than most. I lurked on the M Owner's sample thread for way too long - years. I had been planning to buy one for years, but couldn't justify the price when it was above the $500 mark. At it's intro price, the M didn't deliver. The AF was blamed over and over again for being slow, etc. Knowing that the AF was the Achilles heel ruled it out for primary camera work to me and it seemed more of a luxury item until my camera and lens kit developed more. Seeing the price drop to around the $300 level made this too good to pass up. I think this is where a lot of others started to pick the camera up.
Now back to my situation. My wife is a great cook and has been interested in food photography but was way too intimidated by all the DSLR buttons and settings to mess with it. She is very smart, but impatient with technology. She has been using her cell phone for pics, but became increasingly dissatisfied with the quality compared to what my 5D's were putting out. This, I felt, was the perfect opportunity for the M. I bought one used on eBay with the 22mm f2 lens. Right out of the box, I was very impressed with it's size and quality feel.
My wife took to it like a duck to water. The touchscreen worked flawlessly helping her make quick settings changes. She mostly shoots in Av mode and only has to adjust the aperture depending upon the look she wants. Auto ISO works well, but you still need to keep an eye on the shutter speed in some situations (keeps it around 1/30 second indoors). For food, it is fantastic. Obviously food doesn't move (or if it does, you aren't doing it right) and the AF seems blazing compared to her cellphone, but falls a little behind my 5D's. Not a big deal if you are using it for food or other stationary objects. AF has always been accurate.
A cool feature is the touch shutter setting that can be easily turned off and on. My wife has been able to hold a drink or small food item in her hand and then bring the camera up to her face, touch her nose where she wants it to focus and it takes the pic. Pretty awesome, if a bit specialized and random.
I have played around with it a bit using my other lenses (with the Canon EF adapter) and it does great with what I have. It's pretty tricky to use with the 24-105. The zoom ring is pretty stiff and it's a heavy-ish lens on the EOS M. Not the easiest thing to manage. Works very well with all of my primes and makes the ergonomics much easier if using AF. The 85 and 135 are fast and produce nice results. I have been using it with my 85mm 1.8 and Raynox macro adapter and have gotten some really cool results. Macro works great with the large touchscreen and touch shutter function.
Not recommended for:
People planning to use for kids indoors. The AF will struggle to track and may drop the shutter speed too low to freeze your kid's motion.
Primary camera. If you are serious about your photography or want to make money with your photos, this is probably not the best tool. You really need something with quicker continuous shooting and AF or you may miss too many moments.
Food photography. See above.
Travel. We recently took it on our trip to St Augustine and it made a great, light companion. Beach scenes and museum pieces were a breeze to take with this.
Landscape photography. If you are looking to save weight in your bag on a hike, this seems like a no brainer. Fast AF is not required and you can see the settings change quickly on the LCD in real time so you know how your exposure will look.
Those who are already invested in Canon glass. Consider this almost an accessory to your Canon lenses.
Those looking for something better than your cellphone, but not bulky. There have been times before where we have sat down to eat and I wanted to photograph my meal. I could get out my big DSLR, scoot my chair back and take the pic with a loud snap and get everyone's attention at the restaurant. Or I could slip the EOS M out of my pocket or wife's purse, hold it up like a cellphone, and hear a tiny click. We played out the second scenario over and over again on vacation and no one took notice.