Hi HV,
My son did that overnight last year at this time, it was a great experience. Coach Casey is an old school 'straight shooter' kind of guy. Classic Boston guy.
The field isn't very exciting to look at but a nice playing field, I think. Players are committed and talented, and I think they are usually contenders in the NESCAC.
Your son might want to ask Coach Casey if he has already been pre-read by admissions because, and you probably know this, he will need to apply ED in order to get the support from Coach.
The overnight was a lot of fun according to my son, and he looked appropriately tired the next morning.
Can't beat the academics and fabulous location.