I don't like either theme, but I think they look awesome. I for one would love to change the whole graphics into something else, but I'm not crafty enough.
What would have been cooler if they came in a generic case and for a small fee you could purchase a new playfield, pop it in and a few connections to hook it up. It would be like a video game system with interchangable cartridges, only does pins tho.
Someone should design what I just said, but incorporate a cheap LCD screen in the back, some sort of programming language/SDK, and encourage homebrew/DIY people to make their own.
Shoot.. I wouldn't mind buying one of these, making it more adult size, stripping it down, and paying someone $500 to turn it into a different theme of my choice. Although I'd pay even more if someone could change a real pin for me. I remember a company that did it, but I think they're out of business.