I did go to Carowinds, since it saved quite a bit on 3 passes with fastlanes, but I find Carowinds a lackluster park. This was my second trip and I probably won't go back. I would of went to Kings Dominion, but they wasn't open this past Friday and their hours was short, but Kings Dominion IMO is such a better park.
And not having fastlane wristbands was a hassle. You have to log in to a website each day, add all 3 season passes to it, click redeem on each. It's a strange policy, because if you have people in your group, you could alternate fastlanes with them, because when you go to enter a ride, they scan my phone, see it has 3 fastlanes and let us 3 in, they don't check who's fastlanes they are.