I would probably like participating in something like this, but it's not really an option being on-site. Seems like it's geared towards students on summer leave, and not those who may already have a job or other obligations.
I am now once again working as a software engineer, and would not trade those 3 months at HS for anything.
Feel free to shoot me an email @gmail.com if you have any questions!
A lot of the students seem to have at least a few years of experience under their belt but it totally runs the gamut; you'll meet everything from people a few months into the hacking pursuit to people with decades of experience. And yes, it's a staggeringly amazing program. :)