Yeah, the MX is a great small camera. I recently sold mine because, for me, the ergonomics just weren't quite right. I missed the aperture priority of the A- and P- series Pentax bodies, and the ME and ME Supers, and I found the placement of the shutter speed dial a bit awkward to use with the camera at eye level with my fingers. Generally I never understand people who claim their hands are too big for a particular camera body, but in the case of the MX shutter dial, I did sort of understand.
However, the viewfinder, features (depth of field preview, etc) and general dimensions are perfect.