That's good to hear spacecadit. Ill have to throw up the standard in the back yard next time it gets real nasty. I've only sat through lighter wind blown rain and it got a little misty. Sometimes I feel light rain may be worse because its easier blown. I've also only set mine up maybe 8 times or so, so I am no expert.
I also must say through my experience with all manufactures, brian has been one of the best. Wonderful customer service and his tarps are built top notch. The .5-1oz more for them being "over built" is worth it in my eyes to have a nice long lasting tarp that will ensure plenty of years of a tight pitch.