I like the robo ump. In tennis hawk eye has improved it a lot too as there are almost no umpire arguments anymore, players just challenge and if they are wrong they accept the machine. 20 years ago players would insult umps all the time now the game is much quieter and less emotional.
Sometimes it makes it tough mentally though as in extreme high pressure moments it can help a player to blame the umpire and go off a little while now you just have to give in to a god like machine.
But still in most cases it is better to have the better decision and in tennis players players learned to deal with this too.