A Leica IIIa was my gateway drug into Leica M but the Ms have gone now in favour of the LTM. I think it's because I have a sticky-out nose and, consequently, my spectacles sit forward off my face, that I could never find a way of holding an M to my eye with any sense of stability. With the M's eyepiece being so close to the edge of the body i felt as if the camera was braced between my hands and squashed rather viciously against my glasses - it never felt comfortable. That was why my lovely M4-P was sold. With the LTM cameras having the eye-piece closer to their centre-line I find that I can hold them to my face and brace them stably against my nose. Not only are they wonderfully made, beautiful machines but, in my case, I much prefer the handling.