I have played Dr. Due and PZ alot at pinball wizard when they were open. I absolutely love PZ and could not get into Dr. Dude. That being said I do not think PZ are worth the ~$2500 price point these days. I wish I jumped on one about a year ago that was in great shape for $1800.
I like the red GI trick they used and I happen to find the music and sounds really fun.