I did all 3 summer seminars back in the day (NASS, SLE, and USAFA's). To be honest, I did find West Point's the most rewarding out of the 3, and those are the guys I stayed in touch with for the longest amount of time. However, SLE also helped me decide that West Point wasn't for me. I ended up applying to USNA and USAFA in the end, along with all 3 ROTC branches, and a bunch of civilian schools.