Don't want to get banned or anything
Yes. It is completely safe :-)
I'm sure it is, It doesn't do anything to the games image as in it doesn't add anything to the game. They are both very separate.
For instance, I use Tridef to render 2 scenes of the same game, so the games render is being manipulated. But haven't been banned and wont. Raptr only at best shows an overlay. Nothing modifying the games render. So your safe!
VAC only bans people whos games render (wall hacks etc) is manipulated.