Hardline doesn’t look like it’ll be quite the same as battlefield. So I guess it depends on your situation and what you’re looking for.
for PS3 I think you have to hunt them down in the store, but they won’t cost you anything (you’d also have a chance to cancel the selection if it did for some reason). I also had to download the “premium patch” or whatever it’s called. Also either from in game or the store (sorry it’s been awhile) which is a tiny little (85 kb? I think) file that denotes you as having premium and therefore not needing to pay for the map pack individually to download.
Caspian Border was a really nicely done upgrade to the BF3 map. There’s some new structures and secrets. One of the best being a little tunnel you can swim through in the river around the hill (near B, but toward A) which leads you into a subterranean tunnel and eventually right to the middle of the Hill control point. Also the little canal ways in the giant wall fortification allow you to swim through under the wall. Nice touches like that, which really add to available tactics and routes.