Who uses it? Who loves it?
I use it. Its ok.
I use it on occasion, but I have mines skinned because I hate the standard look of it >>
http://img.photobucket.com/albums/v676/gf1991/DeskScreens/WLMDemo.jpg
I love it. But I rarely use it for the actual messenger. I just love how it gives me notifications when I get new emails. :)