I had extensive time on the Pro before I ever played a single game on the Premium. Both games play great, but I decided to buy a lightly used Premium and I have zero regrets. This game is truly a masterpiece and it's as good as any of the top tier games out there. It also helps that I'm a fan of the band and their music.
There are so many advantages to the Premium, but most of them are cosmetic. The translight on the Pro is decent, but I like the artwork on the Premium better. The light show, spinners, and hammer lock are also HUGE pluses for going the Premium route. The rising cross and upgraded snake jaw don't make a huge difference, but they're a nice bonus. Yes, the hammer does require a bit of tweaking, but it's a thing of beauty when it pounds the ball thru the playfield and into the coffin. This can't be replicated on the Pro.
The spinners that are missing on the Pro were also big deal to me. Sure, you can add aftermarket spinners with cool sound effects, but they're not tied into the scoring. All in all, the Pro is a great machine and gives you 90% of the experience. However, it was well worth every penny to me to get the better machine.