Unlike the rest of ToH, I cant quite reccommend this DLC. It has a severe lack of content. No story. Just 4 fairly bland missions with minimal voice acting. ARMA's horrid npc AI also rears its head here. The usual problems like your gunner not opening fire when the target is in the crosshair or enemy AI that feels like it is a cheating aimbot or at another moment, brain-dead. This was not so much an issue in the base game as there were no enemies, but here it matters. The scripting is also as bad as ever.
You may still be able to like this, but your more likely to get frustrated by it. If you really want helicopter combat, your probably better off with one of the DCS simulators or just ARMA 3 multiplayer.
This DLC should be free, or at worst purchased in a steam 75% off sale.