I have it.
It's good if you love simplicity. But if you liked SC4 with all its mods and user creations, don't bother get SC2013.
There's nothing special in the game right now. City limits are as big as the medium size of SC4. You can't play with the terrain at all. There's no subways. And the sims are fuckin dumbs. No single player (yet!).
SC2013 has its perks tho. The upgradable buildings are a nice touch. Graphics are nice. Upgrading roads is easier. and I like the electricity, water and pollution "animations". I like the graphs also since its in the city itself and not on a minimap.