I have Chad's code in my JP and its a definite improvement. I waited 2 years before I finally updated the code and I wish I would have done it sooner. I used https://mattsbasementarcade.com as well for my ROMs and donated a few $'s on Chad's site as he makes the update available for free.
Some of the things I liked the most with the new code were the randomized starting mode, ball save updates, Mr. DNA changes and the updated scoring in many of the modes.