People wondering if The Beatles is a sufficiently relevant license should consider this thread's post count since yesterday... for all the alleged disdain, there's apparently a lot of interest either way.
I didn't know much about Iron Maiden the band, but I love playing the pin. I'm not at all excited about Beatles as a license, but if it's fun to play, it won't matter.
Personally I have never understood the appeal of "music pins" as a genre. I love a lot of the songs and bands that are featured but the problem is I prefer to hear those songs uninterrupted, and completely through; in a pinball you have callouts, mechs, modes and drains disrupting the music flow so what's the point? I agree the "performance / concert" aspects are energetic and tie in well, especially with visual properties like Maiden... but for me personally, the experience of hearing and "getting into the music" via pinball sucks. For some reason original / unlicensed pin music doesn't bother me as much. Maybe because most of that type is vague and instrumental, so callouts and interruptions aren't as jarring (maybe my filthy casual familiarity with Maiden helped in that regard too)...