This keeps coming up, but let me assure you that in the right conditions (very large rain drops) you will get some misting through the standard 1.1-1.4 oz silnylon.
I agree as I have seen the misting first hand. I don't know if it is due to the quality of the sil-nylon, or just degradation after usage (as Jim discusses in the article on his site). When I had it happen it just slightly dampened my stuff, no big deal. I just didn't like it happening, and getting hit with mist while trying to sleep was really annoying.