@itsmyusername, yes I’m a Stanford grad, from the 1980s.
SEA and SCEEP are fairly well known engineering programs. They are competitive (about 20% acceptance), reasonably rigorous, and fully funded except for the application fee, so that gives them some prestige on college apps beyond just being a constructive way to spend part of your summer. It’s not going to have the impact of something like RSI, but it’s going to have some positive effect (rough similar to something like the Carnegie Mellon Summer Academy), in conjunction with rest of your credentials.