There comes a time in every players game when an all-in shove is necessary, and the reason it is called a flip is because that's exactly what it is, a coin flip.
I have shoved all-in with many different hands, Like K/10, Q/10 K/Q etc all suited, every possible pocket pairs even 2/2, and depending on my chip stack I have called all-ins from other player with a lot worse hand.
It all boils down to Luck and whether you are feeling Lucky or not, If your gut says "go for it" Then just go for it. But to risk your Tournament Life unnecessarily with any hand is suicide, and depending on action before me I would possibly fold Q/Q if 2 or more players are already involved, I have been known to fold A/A in some spots, just feeling that the time is not right and the
odds were against me, especially if there were more than 2 players going all-in, and proven right to do this.
How do you know that one of the other players is not playing A/A before you? It happens! and if two players have A/A then you have little chance of improving unless you make a Flush. Poker is a game of Skill and Patience to wait for the best opportunity to win. Sometimes you have to make hard decisions and throw away a decent hand in order to stay in the game for a little longer and find a better spot!