Lifetime license, here. I do have minor complaints about MM, notably that it's somewhat clunky (startup, waiting to populate tracks when switching library nodes, etc). And it certainly isn't as attractive and pleasant to navigate as the new versions of WMP and, to a lesser extent, Winamp. However, those complaints totally pale when compared to just how powerful MM is at organizing my files. Other players boast good organizing/tagging as well (I guess), but I've never encountered such a full-featured application out-of-box. There are other, individual tools that do what I need for free (such as FLAC -> Ogg conversion for portables), but I love having everything I could possibly need in one app instead of hopping from one to the other for specific tasks. Totally worth the few bucks for an app that runs literally whenever my computer is on!
If MM4 gets a more graceful and current GUI, I think it will attract even more users, and therefore eventually more paying customers. Even with some of the communities gorgeous skins, it still feels like it belongs in 2002 and most people I know cite it as the primary reason they don't like it. I think that DreadM's
Vision skin goes a long way in making MM beautiful!