No I don't yet Neil and I must admit I'm in two minds in terms of the potential damage that my be caused if the guard gets a good hit.
Seeing the pictures that were posted where someone had badly damaged the guard is reassuring but I'm still on the fence.
The Wolf sump guard is more of a sacrificial plate or a rubbing plate.... It gives you the opportunity to back off if you're driving slowly over an uneven surface. In the event of a hard hit, I'd imagine it offers more protection from catastrophic damage rather than causing more damage itself.
My son's school features about 10 speed humps which I go over very slowly - there are about 2 which always just catch a bit. Unprotected I'd be hitting the drain plug, instead I'm scuffing Wolf's plate.
I have no connection to selling these things, but they do more good than harm. Our engines are worth protecting.