I had the quick rod, and YJM at the same time. I ultimately kept the YJM. The Quick Rod is great really, and only got rid of it because i slightly preferred the street rod which i also own. The YJM does the plexi thing with all the modern features very well. The Quick Rod can also get those tones with little effort. I just found myself using the quick rod on Gear 1 OD1/2 as a single channel head with a boost (i use the street rod pretty much the same way).
I wasnt too crazy about the other gears as they get to thick for me, but the amp has plenty of bass for more modern stuff. Ended up trading it because it was redundant to have the street rod, quick rod, and YJM. I do not have any experience with the pro stock but, In all fairness if you were in the market for any of those amps I would say to pick up a quick rod as they are readily available for a reasonable amount of money.