It is a fantastic tank simulation, very busy with fantastic graphics and effects. BUT, it is UNSTABLE.
I checked out the official website for a fix, there is a patch, but it doesn't help. The official forum has EVERYONE experiencing the same problem, the game appears to be flawed.!!!
If you don't mind annoying game freezes, system crashes and/or reboots, then it is a very good game. Once they get it patched to eliminate these bugs, it will be well worth getting. But untill then… it is not worth spending your money on.