Mud x all year. Grippy and fast.
They’re not though, are they? They’re not very grippy for cornering in any conditions – in moderate mud they’re at their best but still don’t corner better than something like a Minion or High Roller. In moderate mud they’re about as fast as a tyre can be but there are much quicker tyres in drier conditions. If you’re not so bothered about corners I can see why you’d call them grippy though because they perform very well for braking/driving for a fairly quick tyre.
They’re not great on wet roots – last winter I found that the key to rooty corners was to get my weight up on the front tyre (Baron) and try to ignore the wayward XR Mud on the back! I preferred the handling of the Rubber Queen on the back but it was harder work to drag uphill or along the flat in the mud.
Saying that, I think they’re a great rear tyre in the winter for muddy woods and hills (but not rocky places) and a good front tyre if straight-line speed matters more than corner speed!