Hi - Had a chance to hit a friend's Callaway X-18 irons on a golf simulator and they seemed to hit very nicely! However, having 4 young kids, they are a bit out of my budget these days.

I would be able to afford pre-owned x-14 or x-16s available online, but am not sure how all three compare. Are there substantial differences (or improvements) with each successive model (especially between the X-14 and x-16)?

Any advice will greatly help!

Thanks

Erik