I have Shock and Panic, but not Apex. Love the Shock so much that my wife, son, daughter, father all got one and all like it a lot. Just a controllable ball with a little pop on backend.
Haven't used the Panic a lot as I just got it. Pro shop guy had one at Masters and recommended taking polish off as it is so quick to respond to friction. I didn't even try it factory polished. Mine has a little haze to it now that makes it look different than most balls. From what I have thrown, I'm glad we took factory polish off as it is the most responsive ball I've had in a long time. I typically have smooth control balls, so others may like the quick change of direction. May try polish on top of 2000 just to try.
I'll still see more use from Shock just because that's the motion I like best, but the Panic definitely has its place.