My son has played keeper since u9 and is now u17. I’ve never heard of them. We had great luck with John Hollinger a few years back. He works mostly in N Va but met us at the MD Soccerplex a few times as he was playing for the MD Bobcats. He does individual training but can arrange to place your child into a group depending on age. All the groups he offered us were too far though. You should find him on CoachUp. I will warn you he is quite expensive. His rates went up a ton after we started with him. But it was money well spent because he really helped my son nail a perfect form.