I decompiled it and went through the code, there are no loggers/backdoors/etc. Very cool utility, I have dealt out 4,581,932 damage as soldier, and 15,448 kills as solly. I need a life.
EDIT: It could use a little work, like only showing stats relevant to that particular class (i.e. a heavy can't backstab, so why show that stat). I'm going to contact Polska and see if he wants to collaborate on v2