I've had both a Superfly and an OES Deluxe (both sil) in winds that were a lot more than I was comfortable with at the time. There be some mighty stiff winds at altitude! Out here, sometimes you can set camp on the 'right' side of the mountain on windy days/nights. However, many times I awake only to discover that the 'right' side, has become the 'wrong' side. So far (knocking very hard on wood right now), I haven't paid any consequences for it. Sil stretches nicely and I think can absorb a lot of abuse, assuming you aren't facing the wind head-on with a side-panel anyway.
I've had figure9s lose grip and I've had them bend to the point of being useless, but my tarps, they still fly proud!