You could do a lot worse. That is in fact not a bad choice at all if spending money... One of the apps I have found to actually work in a day to day situation. . . . and do not think so much about ratings, I find them to be rather worthless.
You use another defense too it seems which is worth much more, common sense combined with a little scepticism and self-imposed restrictions.
I am all over at all times, even places where I know malware is present (I love to see them bash into the sandbox (it can not be jumped as there is no place to jump) while I analyze their attack, then again, I am a little crazy)
Naturally, I do not rely on just one security application but have one for each attack type. Then I have a few tweaks of my own to make sure.
Ultimately, even I anchor it all in common sense, scepticism and self-imposed restrictions (7 day quarantine-time for all downloads unless I have the time to dissect.)
Like I have said before, the interest rate on trust is too low out here... and if I send you a file, check it! I can only guarantee that I did not find any virus on my end... there is no distrust in that, it would actually please me if you do.