I used White Lightning in the lower penninsula of Michigan during the DALMAC. Quite a lot of sand and dust there, as the entire region used to be a sea bottom. I was impressed by how well the dry WL shed the dry sand and dry dust, and even coped with a rainy day. But I really wasn't happy with the chain chatter that developed. From what I've gathered, that is a fairly common issue in dry conditions with WL.
From what my boss the bike goddess has said (and my own experience with my old bike) WL is pretty awful in rainy Pacific Northwest conditions. I'd looooooove to hear from some folks who've used the new WL-Wet in the wetter parts of the world.
I'm not too impressed with Boeshield at the moment.
"If Americans want to live the American Dream, they should go to Denmark." - Richard Wilkinson