Norrin Radd
Tour Winner
but surely the art of the game is to best guess the distance ,we can all hit skanky shots wether we use our eyes or a dmd . and experience of playing the game is a big thing in judging conditions over head or underfoot.It is very easy to just look at the distance and you get into the habit of always hitting the same club for the relevant distance.
However distance is only one variable. Elevation is important & often very difficult to judge. Wind speed & direction. Air temperature, amount of run etc.
Probably without the device you are also going to allow a bit more margin for error as well but when you have an exact yardage you feel happier going right at it, rather than maybe playing away from trouble.
try using your senses rather than tech ,you might find that you wasted a few quid on something you never needed in the first place.