I've been addicted to this game the past 2 weeks or so. I have no connection so this isn't some ad, its just awesome and I know there are people here that will like it too.
(I'm an Android guy, you Apple guys can find it yourselves!!!)
I'm on Tier 2, upgrading my SS every day. Gotta win some real money to get into that ZL1! (Probably the only chance of ever actually saying I'm driving one haha)