I haven't had them in mud, but they seem to do well in rain and snow. They have about the same traction as the BFG Radial A/Ts that I used to run on my pickup.
I can also confirm the vibration issues at highway speeds and this seems to be prevalent among different tires of this same brand. On long drives it seems to eventually (not totally) go away. Cold mornings are bad for it too. I normally run a short (10 mile or so) jaunt at about 65-75mph and that's where I notice it. Street speeds I notice normally only when the tires are cold.
Road noise at high speeds is hard to tell as my S10 has a louder than stock exhaust. However, when coming to a stop on pavement, you can hear and feel the rumbling of the tread up through the stiffer off road suspension of a ZR2. I didn't have that with BFGs.
They seem to be doing well wear-wise and I do take corners harder than normal, especially highway clover-leafs. Cornering I would compare to the BFG Radial A/Ts as well.