I don't see much difference in play between a FR and a low-buy-in tourney ($5 or less). When you get into $10-$50 buy-in tourneys, you will face tougher opponents, and will have to make difficult decisions due to higher frequency of bluffing (as a previous poster stated). Pay very close attention to the board and the play as it develops to try to get a sense of whether or not you are ahead. I can multitask during a FR or low-cost tourney, but if I invest more than $10, I focus on the game almost exclusively.