Thanks for the replies guys,
I have to admit, I can't get along with the look of the regular X Hots... that extra bulbous bottom stuff just doesn't look right to me. It looks "added on". I'd be OK with the X Hot Pro though. In the X2 Hot they were able to concentrate that mass into a smaller area so it looks much better to me. Also, I'm coming from blade style Mizunos so I'm generally fine hitting irons with narrower soles.
I don't really need longer/hotter clubs... I just want some that consistently go the same (predictable) distance and feel good while doing it! That's where the XRs got my attention. They felt better than the non-forged JPX 850s. I should probably also try the JPX EZ Forged.