I was interested in buying but concerned on the safety?
What do you mean by security? If you assume that the software can be malicious, then it is not. Hundreds, if not thousands, of people have downloaded it and no one has yet lost their accounts. And if you meant VAC, then the situation is like with all cheats, basically everything depends on you and your experience of a legitimate game, in case of your mistake, the cheat is not responsible. The software, in turn, also gives a guarantee on not detection, but not 100%, because it is simply impossible to know for sure. Valve can detect, and perhaps not.