2017 did the George Mason camp last year. I thought it was a good experience. Have done a lot of camps/showcases so I am speaking with experience. Was well organized, they've got a quality field. A good turn out of coaches from other mid-majors. No elite schools present. I'd say there were 10-12 coaches from mid-majors.
Son has shut arm down for fall/winter and now focusing on basketball. Otherwise he'd be there again this year. Good luck!