I have a stalker - and had a son that played in ncball's program.
The issue as I see it is when is it appropriate for me as a parent to use my stalker - and when is it not appropriate.
It is never appropriate for me to get behind home plate when the college coaches and pro scouts are there. They are there to do their job and they prefer to have their space (e.g. no parents sitting there looking over their shoulders, reading their notes, etc.)
It can be appropriate to use it during a HS game if no coaches or pros are there to watch - and if the HS coach either doesn't care or wants the numbers. I always asked first and then got it out of the car.
I found it to be most useful when 08Son had a pitching lesson and we were looking for things like difference between FB and CU.
08