It's honestly not worth it, even for a free beta. I've been playing a lot of Battlefield 3 recently, and that game is so much better. It's not just the small maps and change of focus, it's the way the game feels and plays. It seems that the new engine/netcode/whatever is just bad, on Battlefield 4 and now Hardline.
This is nothing more than a cheap DLC, they've not even bothered to remove some of the high end military gear. It's basically the same game, but smaller, not as good and with new models and names, they've not changed anything meaningful.
Save your money and get Battlefield 3, or Payday 2 if you want a proper heist game.