Mine did UMich MPulse online two summers ago when they had to pivot quickly for covid.
He found it to be very satisfying and he got a sense of what working with college faculty was like very early in the research process of a vocal performance major. They only worked on solo pieces, likely due to the online format. I do recall that they added a “Solo Track”, but that went away when it became an online program, however, like I said, all they did was work on solo pieces. He really enjoyed it.
Assuming the in person program will be quite different, but my S thought the faculty was great and he got a real sense of where he stood in comparison to his peers and those a bit older.
He also did the ArtsBridge Art Song program (online at the time) and loved that one because the faculty comes from a variety of schools, not just one. I recommend that program and organization highly. In fact, he met his future studio teacher during that program!
And! He did Carnegie Mellon’s precollege program- online, that one was a bit of a disappointment. I imagine the in person version would be a lot more satisfying.
I only wish he had one more summer to do an in person program, but oh well!
Best of luck to you and yours!