Folks should always prepare for the surprise onside kick, I always do because I play this guy who will use it at the drop of a hat granted its a one time thing BUT he got me one time in a crucial situation, at KO start of OT and I loss so LESSON LEARNED never again.
I pulled it on a guy at the start of an OT just like it happened to me once b4 and it paid off for the win.
NO did to Indy in the SB, BOOM BOOM "its in the game"
But as Grim says to each his own, I'll use it if I think its needed but normally I dont...case by case basis or game by game basis