I played the demo and preordered the limited edition. Looking forward to playing it.
Like any online game, there will be teething troubles and nerfs while the balance is discovered. The addition of online content over time will also keep it fresh.
I like the idea of the online trading with other cities and it seems that the degree of interaction with other players can be set to suit your playing style. I'm more a casual online player and don't like to feel like I'm in any sort of guild constantly monopolising(!) my time.
My one concern is that city building games generally have a very fine balance point where the economy is stable (without skyrocketing or going into freefall). I'm a bit worried that I spent a lot of time building a large city, getting the balance just right so its self sustaining then an update comes along and completely knocks it sideways.
The monthly fee is peanuts so thats not a concern, but what I'm not sure of (and someone may be able to enlighten me) is whether any online content bought can be played offline, and whether we'll still have access to it should we cancel our subscriptions for a while?