I bought the P600, because the versions with mobile network hadn't come out, yet. It's still a nice tablet after all this time, the right size for me, gay enough and the possibility to use micro sd cards. I am not a fan of Touchwiz, it's too bloated and slow. I am very disappointed, because it looks like there will be no official lollipop update, but use this to say thank you to all those great people in this forum, who really make these older devices shine like new! Just yesterday I've had enough and installed a custom rom. The rom in question is quite good, but to buggy to be useful for me, yet. I am now using the LiquidSmooth rom and it is awesome, the name really gives it away!
So to come to an end: It was a good decision when I bought it, it still is a good decision in hindsight, helped a very great deal by the wonderful people on this forum.