They have both of these in Flippers at the Outer Banks (Grandy), NC. I wasn't able to get very deep into either but, on first impression, Metallica was cool but WOZ pretty much blew me away. I was really impressed with Jersey Jack's build quality. Everything felt very smooth and sturdy, noticably better than the Metallica and noticably better than a Bally/Williams. The best way for me to describe it was that it felt like a Bally/Williams, hooked up a few notches. I was unsure how I was going to feel about the LCD but that was really damn cool too. The toys on WOZ are beautiful as well. The color changing LEDs, the playfield, the flippers, everything just felt top notch. The only thing that I noticed was that the upper VUK needed adjusting because it wasn't kicking the ball up on the first kick (I heard these may be adjustable?) Anyway, on first impression, I really think Jersey Jack set a new bar for quality. I couldn't stop playing it. I just ran out of time.
For the purpose of full disclosure, I don't have either of these games, and I don't have either on order. I just like pinball in all forms.