Count me a believer.
My 2018 RHP did a local PG Underclass showcase last August. There were a handful of college scouts in attendance. In the weeks following, he was invited to guest pitch at a national PG event and the emails began coming fast and furious.
It is a good vehicle to see "how you stack up" and to show what you've got. Talking to some head coaches, they like PG because there is indepenent verification of a skill (fast ball, pop time, etc) and videos.
Yes, $650 is steep, but it was well worth it to us.