As someone who also just ordered a NIB Metallica Pro (waiting on delivery) I was also in the same dilemma. I am not a huge fan of either band actually, care more about the games. I have two other machines with multi flipper, but what kept me to Metallica were two details. Baked code and the reliability and ease to work on a SAM system vs the new SPIKE system. With this being my first NIB buy, I wanted something I knew I would want to play for a long time and I would be comfortable working on to keep it in good working order. Not trying to start the SAM vs SPIKE debate, but that was a big reason for me personally. I think the look and PF of IM is awesome, but MET is tried and true. Won't leave the top 10 anytime soon IMO.