I actually never bought MMJB. I remember I tried it a few times but it could never successfully import my music library (which was a tiny fraction of the size it is now, but was big for that "era" I suppose). Kept locking up.
I'm actually a refugee from Real Jukebox. I used it for a long while (and purchased it) until they switched over to the horrid Real One. For a long while I stuck with Real One, hating it every day, until JRiver's player finally got nice enough that I switched over.
Even back when I used Real Jukebox, I remember generally hating it... I kept trying JRiver MJ (starting with v6 I believe) because it got consistently high marks from the old CNet editors (back before they became the terrible corporate shills they are now). But, for admittedly stupid design-focused reasons, I didn't make the full switch until much later on when the look and feel of MJ was redesigned (v8 maybe).