Had a guy in my class get through most of formation in t6's and then wash out. We all saw his heart wasn't in it and he was just waiting to fail enough times to be kicked out. Additionally he was always a pessimist in the flight room bringing everyone down. If you go and decide it's not for you, still keep a good attitude and help the dudes around you out, it'll look much better that way if things don't go well or you decide it's not for you.