The reviews are the reason I bought the Zen M. When I was looking for a player I wanted a FM receiver incorporated. It was by far the best option at the time. The iPods are great at about the same price but without FM, it's a $50 option add on gadget. I use it when I'm on the tractor and now with the aux device jack in my new Monte Carlo I don't need to wear the buds in the car, it plays through the stereo
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The Zune is a great item but it wasn't available at the time I bought mine. It's only advantage is you can select a background of your choice. Didn't get it for the son cause (and no real reason not to) it has a MSos integrated on it.
Be careful with the jacket you get for it, mine is made of that wetsuit material and it's tight. Cause's the controls to act up, soon as it's off it's fine. It is getting better cause the jacket is stretching a bit. IMO, it's a great unit and the FM is a nice plus!