Bought version 8, which was quickly replaced by 8.5 (free), which was quickly replaced by 9 (upgrade), which was quickly replaced by 9.5 (free if you already upgraded), which was replaced by 10 (another upgrade), which was...
I still have the original, and was nicely upgraded for free to 9 when the 8 stopped working when Adobe released Ps CC 2015, but I don't use it mainly because a filter program that costs that much should not go require upgrades every year. I'll use the Nik Collection over it any day of the week. It's got a couple handy things, but not worth the money when Nik is free and, frankly, a better tool IMHO.