I haven't tried downloading a town yet, and not too sure when I will. This is not because I don't trust CC (I use quite a bit of CC myself from trusted sites), but because the world is only as good as the person making them is. And frankly EA have a whole team working on something like this. That is why the EA ones are the best ones so far, they have the resources to make all the houses in them stylish (or not), and different to each other. So far I'm happy modifying existing worlds with different houses, etc. And now that there is the in-world editor to change lot sizes and place new lots i'm quite happy with this.