I received my EOS M with 22mm lens and the bonus Speedlite 90EX from B&H as part of the recent $300 offer. Since I missed the first wave and had to wait until B&H received additional product, it didn't arrive until July 26th (the day after I departed on a 10 day vacation), so I only started playing with it last night. (And the 90EX may be good for something, so it IS a nice bonus). So far, so good.
Being cheap, I didn't spring for the Canon adapter for EF lenses. For around one half price, I bought one from Mega West. The good news: it seems to work as advertised. The software recognizes the correct EF lens and the lens settings and reports them in Lightroom.
The bad news (and warning): my 17-40 L is now permanently attached to the adapter. The release button (which is supposed to depress the pin, allowing the lens to be rotated and removed) does not depress.
Does anyone have any good ideas on how to get the lens and adapter separated? I would love to have something left of the adapter to send back to the seller, but at this point I would really just like to have my lens back in operation, even if the adapter is a total loss. Having learned a valuable lesson, I will spring for the Canon version in any event.