I've now taken my E-M5 on several backpacking trips. Overall, it's been a success - image quality at least as good as what I used to get with my Nikon D700 at a fraction of the weight. That said, there are a couple of things that are causing me headaches: On/off switch gremlins. Camera turns itself on fairly frequently. This would be only a minor irritation, except that once on, various settings have a habit of changing themselves (see e.g. shooting mode). Gloved operation. With anything thicker than liner gloves, accurately operating the four way controller, and even the on/off switch, is very difficult. Battery life. At roughly one battery per day, that's 3 extra batteries I have to religiously charge and bring for every extended trip. Image review quirks. For some strange reason, Olympus doesn't let you magnify the image during image review. To confirm focus, I have to press play after pausing for several seconds (pressing it immediately does nothing), and then hit the EVF button because playback always goes to the LCD first (useless in bright sunlight), regardless of EVF setting. None of this is to say that the E-M5 isn't a great tool, or the best option I've yet found, but it could certainly stand some tweaks for usability as an outdoor carry-everywhere camera.