Let's put it this way... you will love the KISS pin a whole lot more if you're a KISS fan. People are pissed there is still no code for the Cities mode, but in general it's still pretty finished. I'm not sure how it compares to Xmen.
I have found it fun but not enough that I'd ever consider buying one. And I'm a KISS fan. Are you set on buying a newer pin? If you're looking at KISS you can't go wrong with a mid 90s B/W pin, but price-wise you'd have to settle for one that's been well-loved.