I'm currently in the process of depleting some overstock inventory, mostly ProV1/ProV1X that I've had sitting around for a couple years. Also some Srixon Z-Stars, and give or take a dozen or so Bridgestone B330RXS.
For the price - the Srixon Z-Star 3-pc is a really good bargain, great performer and probably the most durable ball on the market. I'm particularly fond of the Yellow - I don't have to worry too much about someone mistakenly hitting my ball or vice-versa, although obviously I still mark it for identification purposes just in case.
I played in a regional match last Sunday, mid-40 degree temps, light wind. It wasn't overly pleasant whatsoever. But that yellow Srixon really held its own. I shot 73 and really only missed two shots on the day with it. I think it's one of the straighter balls off the tee, great distance, soft feel, and offers excellent control on chips and pitch shots around the green.
I've tried the Callaway Chrome Soft - like it. But not sure there's $10 difference in performance between a box of those and the Srixon Z-Star to be honest.