For the installation you have to login once (or in my case, enter a new code). This creates a new account will be created (although I have given the same data as before). On this website you have to go to be protected unit with his and select its version (to choose from PC, Mac, Andoid, iOS and Windows Phone).
On my phone (LG G2) everything was not a problem. I was fed directly into the PlayStore Weier, have the app intalliert and could directly perform a search and check everything on safety. I particularly like, for example, the display of apps that could potentially affect the privacy (with me were the "only" Whatsapp and Facebook).
The search is quick and seems reliable. Also you can enable the remote control of his cell phone, if you should lose it once.
Also on the PC I had only good experiences. The program runs unnoticeable in the background and makes the PC unnecessarily slow. Very easy to reach with 2 clicks of the Gaming mode, which I always like to use for online games (well if I my ping times forget usually never higher than 40).
Also very well done, I find the banking protection. Once you go in any banking site are automatically blocked outgoing data to prevent espionage. This is very good to notice if you do not turn off the protection and for example goes on Youtube. Since then nothing more. After switching off then immediately returns everything.
From me a full purchase recommendation. In my opinion, the extra cost compared to the free variants is worth.
For all install for the first time a new Antivirus: Previously necessarily uninstall the old AV. Otherwise there may be some software problems.