Now I've seen the poll I guess my answer is mostly because my SLRs do everything I need with an element of mirrorless is too small and fiddly. As it happens I do have a mirrorless camera (a Panny G3) which does deliver decent IQ but I do find the controls a bit small - and I don't even have hands that big. On top of that I also find I all too frequently hit some of the controls while shooting simply because there isn't enough space to simply hold the camera. I note that some of the recent introductions are a bit larger so maybe the obsession with ultra miniaturization has passed in favour of sensible ergonomics. The poll question as phrased almost seems to infer that I should go mirrorless to which my reply would be -Why?