I have only purchased two NIB; AC/DC Premium and Metallica Premium Refinery Edition. I hova owned AC/DC for 10 months longer than Met, but I have played twice as many games on Metallica already (I bought it in July last year). I want to play Metallica often, and I play at least one game on most nights. I play AC/DC maybe once a month now.
This summer, I will choose between selling the AC/DC, or spending the money on it to add all of the Pinball Refinery mods. I am leaning towards selling, but my wife wants it to stay. I may add the mods just to try to turn it into a game I want to play more.
To be fair, I wanted Metallica more than AC/DC when I bought AC/DC. My wife liked AC/DC more, and mature Metallica code was a long way off at that time, so I bought AC/DC instead. It is fun on decent games...actually a lot of fun, but I don't have much fun on the crappy games which happen about 99% of the time for me.
I don't know how much the Refinery mods elevate my opinion of Metallica, but I am sure it is substantial. I smile every time I play it...even when it kicks my ass.