Bought the game. I'm loving it so far -- highly recommend it to anyone who is interested.
A friend told me to wait for patches, something about "undo" when building being impossible? Is this incorrect? I'm inclined to waste all weekend playing this.
An undo button would be great -- but the lack of one hasn't overly frustrated me right now. As of now, if you want to delete something you just built, you have to actually bulldoze it. A bit annoying but it hasn't really affected me at all.
A lot of stuff is getting modded that's helpful -- you can pull intersections, buildings, new features, etc. As an example, in the base game you can only purchase 9 of the 25 plots of land, but you can easily get a mod to allow you to use all 25 plots of land. There's mods that let you change whether or not an intersection has a traffic light, traffic patterns of certain lanes, etc. More and more is getting modded.
I'm having a blast with it -- I definitely view it as more of a sandbox-type game than anything else. It's not like it's a exercise in maximizing efficiency or anything like that. You just build stuff that you think looks cool without bringing your city to its knees -- I've had no problem progressing after getting the very basics out of the way.