The general take here is quite interesting, and there are many good points.... I have participated in SURF programs at Mt. Sinai and the Mayo Clinic, and I plan on doing one more this summer (accepted into Sloan-Kettering). I, however, feel like that these experiences have been very valuable and great overall opportunities to learn so much within a 10 week timeframe.
That being said, I agree with the people on this thread that summer experiences cannot make up for long-term research projects. I have been working at the same lab for the past two years. I love it there, but I feel young and naive, so I want to go out and experience different kinds of research with different kinds of people at different types of locations. I feel like these programs open my perspectives. I learn so much about other research going on besides that in my own lab. I learn about different philosophies of science from different mentors and get the opportunity to meet with highly successful people at highly regarded institutions. I know I'm more likely to get sig. publications at my school lab as opposed to these, but there is so much to experience with them...
I agree that it is harder to get a grasp of the science from summer programs, but it is by no means impossible. I got so interested in my research at Mayo (nitric oxide stuff) that I did lots of literature review during my time there. I feel confident i could discuss this with adcom relatively well.
That's just my opinion.....I agree wholeheartedly that year-long research gives you more depth than summer programs, but if you work in a lab during the academic year, it is to your advantage to expand your experiences with a summer program.