Yeah sure, they're fine for sprint events like the O-course and CRT/Combat course. They are quite a bit lighter and do allow for a bit more spring. However, like has been said before, they lack tread (the soles are actually a kind of hardened foam-like material) and support for activities such as humping. I've seen candidates really screw up their feet due to wearing lites on long humps. Again, some guys LOVE them...I'm wary.
Personally, 590 Belleville Jungles are my favorite. They issue the Bellevilles and Bates at OCS. You will recieve a pair of jungles (distinguished by the water/ventillation grommets on the in-step) and a pair of gore-tex ICB's (500 Bellevilles).