Other than Dialed In I just haven't really enjoyed any JJP games thus far, GNR included, there's just something about them. I'm pretty sure even if they were the same price, I'd have gone with a GZ Pro over GNR. I just got a GZ Pro and it's pretty dang great even without the extra Prem/le mechs.
That makes me sound like a JJP hater, but there is no denying they are impressive machines feature and appearance wise. There is just something with playing them that has been a miss for me (probably mostly theme on Wonka, it plays really well). I'll be really interested to see Steve Ritchie's first JJP though. I hope it's not a crappy theme - his games here could be really something great...