Last time there was a sale on Steam for TOH I got it. Not sure it was a wise buy but it was only $10 so I made the move. I played the campaign once and have had a hard time getting into it the Mi-24. If you want to get a feel for what its like, download the demo and see if you like it. Its interesting how they are able to blend a sim with a FPS but in the end it feels like a flying the helicopters in ARMA with a joystick and throttle instead of keyboard and mouse. I was hoping for something along the lines of the Microsoft Flight Simulator X missions but with more fidelity. Seeing the SWAT team fast rope down from the helo was a nice touch in TOH. The down side was that in order to land you have to go into "hover mode". Since I can land a helicopter in MSX no problem I figured I could do the same in TOH without needing the "hover mode". Not so. I crashed or hard landed almost every time. That said, once you've transitioned to forward flight its pretty fun, especially the N.O.E. flight.
The Mi-24 was a bit of a disappointment. I've been looking for a way to get in the virtual Hind cockpit and this wasn't what I was looking for. I must admit I haven't put a lot of effort into getting to learn it, but it it is a "light-sim". I'm having a lot more fun just fly the Hip in DCS in the quick missions.
For the money, if you're looking for a sim to fill up a few weekends it makes sense, but its not like Strike Fighters, IL-2, or MSX that keep me coming back especially with a great community behind them.