I am a little perplexed by some of the comments about the EOS M on this forum. I just read one comment describing it as a 'turkey', and a previous comment implied that AF with the V1.0.6 was unusable. These kind of comments, apart from being wildly inaccurate, don't help anyone.
I am a long time SLR user, starting with a Canon A1 in 1982, then T90, and moving on to a 10D and 40D in the digital age. I still have plans for a 5D III, but no longer wish to haul around a heavy bag of DSLR gear for general use. For the last four years I've had an S90 clipped to my belt all the time and it has done a great job, however, the image quality isn't the greatest and I wanted better image quality to record my daughter growing up.
I bought an EOS M last week. The prices have come down a lot recently, the sensor is better than in my 40D, it is very portable - especially with the EF-M 22mm, and it is extremely flexible and versatile. It can accept all of my EF and EF-S lenses and if I wish I can use a large Speedlite or ST-E2. I have just been on a short trip and had a chance to try it out in the field with the V1.0.6 firmware. Here are my first impressions.
AF - not the fastest, but to imply it is unusable is ridiculous. I upgraded to V2.0.2 a couple of days ago and there has been a big improvement. I have yet to give the new version a thorough test, but it is looking promising.
No viewfinder - not a problem for me personally, but not ideal when using long telephotos. The EOS M is touch screen driven and changing settings wouldn't be possible while looking through a finder. The user interface is designed not to have a finder. If it really bothers you, I guess you can buy another manufacturer's finder and clip it on the hotshoe.
Image quality - excellent. I still love the IQ from my 40D, but this is better.
Battery life - not great. The touch screen, IS lenses, and other functions all drain the battery. On a full charge I managed just under 200 stills along with a few minutes of video.
Video - a big improvement over the S90. Continuous AF with STM lenses and the largest video format fills my 1920x1080 monitor. These improvements will encourage me to do more video.
I bought a kit with the EF-M 22mm STM, EF-M 18-55mm STM IS, and 90EX flash. I bought the EF-M adapter separately. Both EF-M lenses have impressed me. The 18-55mm has a very useful focal length range and the IS is very effective - I handheld some shots at 1/8s and got good results. It's always good to have a fast prime and the EF-M 22mm is also very small and light.
The adapter is a great advantage with this system for people who have invested in EF and EF-S lenses. I haven't used all my lenses on the EOS M yet, but the EF 100mm f/2.8L works well, as does the EF 70-200 f/4L IS. I have been shooting in JPG and the camera's built in lens correction capability does a great job with removing vignetting on the EF-S 10-22mm.
There is no built in flash, but the tiny 90EX adds some natural fill flash to backlit subjects and the camera handles all the exposure without me having to fiddle around.
All cameras are fun at first but I've had more fun with this one than most and I'm looking forward to using it a lot more. Sadly, one of the reasons I delayed my buying decision was due to the misinformation on the Internet posted by people who apparently don't own the camera.
No single camera is suitable for every photographer in every situation, and the EOS M is no exception. I don't shoot sports and only photograph birds occasionally. I don't need blazing fast autofocus most of the time, and if I do I will take an SLR. I used to miss many shots because my heavy SLR was at home. The S90 fixed that problem. The EOS M is almost as portable as the S90 (especially with just the EF-M 22mm lens) and it gives me APS-C DSLR image quality.
How many people actually like the EOS M?
I do. A lot.
I've posted a few sample images and personal thoughts, and as I use the camera more I will add more to this page.http://phil.uk.net/photography/canon_EOS_M.html