Defining V1
And so the very definition of V1 continues to be debated in the aviation world.
The devil is in the details as one group points out that V1 should really be called "continue/reject action speed". It is the speed at which the first positive action must be taken, not the speed at which you actually make the decision to reject.
A cursory study of available data will show that rejecting above V1 is like trying to win in Las Vegas. The odds are with the house.....
I have only rejected one takeoff and it was at rotation speed in a C23 in Iraq with about 7000 feet of runway in front of me. The flaps were not set properly and the decision was obvious. No harm, no foul. However, as a 744 FO, I don't envy any of my Captain's responsibility to reject a max gross weight whale.....