Hot topic this these days in cricket. Old powers want it, champions don't. India says it's not fool proof and also cost prohibitive as it costs $56,000 a day for hawk eye. That it's not entirely fool proof has been proved in the world cup as many a times hawk eye was limited by "least count" when it could not judge the ball track when the impact was beyond a certain distance. Add to that because there was no snicko, many edges were not heard during the world cup though the players were one hundred percent sure there was a nick and the tell tale sign of a batsman looking behind immediately. The debate is going to rage further now because of the howlers by Daryl Harper. For me you need better technology in terms of hawk eye having better ability assisted with hot spot and snickometer to be 100% sure of technology assisting on field umpires. And yes we need better on field umpires as well.