I have spent the past week in Hawai'i surfing, snorkeling, and boogie boarding. I fry to a crisp and this has prevented me from needing to wear sunscreen on most of my body. It is comfortable and I don't overheat when I'm putzing around town between wave visits.
PROS: i'm overweight and the loose fit makes me feel less conscious on the beach. great UV protection. Breathable.
CONS: when in the water for more than 4 hours, it tends to get a little stretched out, but when it dries this goes away.