I have some experience with this program, I used to work at a local repair shop that used this for installing nearly all of their drivers. The program does what it advertises very well, it will install a ton of drivers for you and the program is very simple to use.
I've run the thing through a few different AV / Virus Removal programs and it has turned up clean, but that doesn't necessarily mean it is safe. I have noticed that it changes your OEMINFO properties to advertise itself further, which when working on a client or customers computer, is a very bad thing. For example, if you go to My Computer -> Properties, it will have changed the 'Manufactured and Supported by' tags in Windows Xp, Vista, and 7.
From my experience, it works well, but I don't recommend using it. Like some of the other answers here have said, it requires minimal effort to find and install drivers from a more legitimate source (Manufacturer Website). Also, I believe it is of Russian origin and impossible to find support for.
Tl;dr - It works well for installing drivers., but you probably shouldn't use it. Alters system information without prompting, and that usually isn't a good sign.