Got the Mini-M last year, love it (but I'm not exactly a keyboard-aficionado nor a fast typist). Best keyboard (well only 'proper' one) I had since my Cherry branded keyboard in the early nineties. Slight annoyance though is that there seems to be a well-known firmware bug disabling the 'q' key every once in a blue moon (three or four times so far). Nothing a disconnect/reconnect can't solve, but it's annoying if your password has a 'q' ...

And yes, too loud for the modern office. At home I got used to it and don't really mind anymore. Too heavy to carry around in the back-pack, but I do appreciate the 'heft' on the desk at home.