I have a 7D (and maybe a 70D if I can get the focus fixed) and have had a lot of great shots with it through the years. I'm not wanting to get rid of my Canon DSLR setup right now, but I've gotten other interests through the years and frankly don't shoot as much. I also travel a ton and it's not easy to go backpacking with a DSLR. So I went to Mirrorless.
My first experience was with the E-PL1. Neat little camera... slow as balls. Got my usage out of it. Upgraded to the Panasonic G3. Love the LCD and video mode and size.... but frankly, I'm disappointed with the photo quality.
I was out in Colorado this summer and had both my 7D/Tamron 17-50 and my Panasonic G3 with me for the hikes
Although I got some good photos from my G3, nothing seemed as sharp or to pop nearly as much as anything from my 7D did -- even with extensive post-processing.
It's bad enough that I often just leave my camera at home and use my LG G2 camera for things. Not that there's anything wrong with it, I just don't feel like carrying around any camera when I know I'm not going to get the quality that I get from my DSLR
So I'm back to ground zero.
I don't really want to spend much and I'm OK with used / older models. I just want quality. Size is important. If it's anywhere near a DSLR size, I may as well just get the SL1 and call it a day.
I haven't been super impressed with the Mu 4/3 sensors, except the most recent ones... which means $$. Thus I'm concentrating on the APS-C cameras, mainly the EOS M and the NEX series. I'm leaning toward the Sony NEX-3N with the 16-50 power zoom.
I don't need fancy features. Just something that takes good photos and is compact. To be honest, I leave my mirrorless cameras on the "auto" or "program" modes most of the time anyways. I don't usually have time or care enough to go with manual control. I'll save that for my DSLR when I'm actually shooting.