My boyfriend George just got a pair of Skins cycling bib longs. His first ride in them was a century in the Santa Monica Mountains about a week ago, and then he wore them on the 600km brevet (372 miles) on Saturday/Sunday. He was impressed after the century and subsequently SHOCKED that the chamois held up for 27 hours of straight riding on the 600km. He actually said he's gotten more chafed on shorter rides in his Assos...and he's a die hard Assos lover. Whatever they've done, they've done it right.

He reviewed them on his blog about a week ago http://epictrain.blogspot.com/ and that was before the 600km. I expect another rave on there soon.