Best thing I have ever stuck on the back of a woods bike. It goes through everything. I run about 7psi with dual Motion Pro rim locks and an ultra heavy duty tube. I leave guys with knobbies spinning on the rocks and roots. It is almost unfair.
Only times I noticed them not being as good as a full knob was in pine needles and when you really need power in sand whoops to stay on the tops of the whoops. Mud was not an issue. You just need to ride smoothly.
They give up some on steep downhill braking if you lock the back brake.
Run the same deal on my KTM.
and..yes they get very muddy. Just happen to be clean here.