The M5 is just a different camera that's all, not your M3 or M6. Great meter, in a little bit bigger body than an M6. Different cosmetics, different ergonomics. If you like it, you tend to love it; if you are unable to like it you tend to hate it, and unfortunately many of those who don't like it deride it. Give one a try and see what you think. It shouldn't be a money losing deal unless you spend too much for one.