Great deal, but keep in mind that the next game, Civ 7, comes out in less than a month.
Civ games usually don't get to their best versions until their major DLC comes out, so it's still not a bad time to take a look at 6 which is feature complete since 7 will take a while to get there. But anyone looking to get started fresh with Civ 7 might want to wait for that.