Joe, my son was an Olympic level egg layer with the machine. His mean coach (me) only used it for gauging velo, seeing the different ball flight shapes. I guess I never wanted him to be a hack attack warrior and wanted his focus on timing the release on the hand of the pitcher or front tosser. Summer of his rising frosh year, we did transition to the hack because he knew the HS tryout coaches uses machine BP and he wanted to rake with his sequencing intact. It took about 5 sessions. Good hitters will adjust. Make pitching machine BP part of his "routine" and he will be fine. One showing will not make or break your kid. As Mom stated you should only attend these showcases if you have metrics the colleges are interested in. I am not sure how close by that P5 is from you, but If you want to get a baseline metric and some showcase experience for your son, that is fine but the local colleges have them too.