It is entirely safe, if you use it smart. You are still playing the game, just don't go for scores that require reviews. I've had all my review scores go through but it's still safer to keep it under. Just make sure you double check the "Infamous Joe's List of Impossible Scores and Wait Times" and "Infamous Joe's List of ALL Review Scores" with your games to make sure it's a legit score/time and you're good to go.