I bought the official version of TS3 because I liked the game and wanted to play an expansion pack, which ended up not working on my computer. I need a new computer, but it plays the base game just fine, even though it technically doesn't have a good enough processor to meet the minimum system requirements.
It's fun, I usually play for hours at a time for days. When I get bored with a family, I just make another one. I'm addicted to custom content now.