Yeah I hate the fact that they cost money.
I got around to trying China Town now.
It's a good version of "District", it's an urban map like "District", but far from so crappy (District is the wost piece of shit in CoD). You are not forced to go milelong detours just to get on the other side of some building, because a lot more of the buildings have interiors, and several floors (basements even). No roofs as far as I have seen though. Overall a good map.
Definitley not a sniper map, but you can still have a lot of ranged fights.
I also discovered that there is a fourth map called Killhouse, which I've yet to test, it doesn't ever seem to pop up. I overheard some chatting, and none of them had managed to get a Killhouse map yet.