I just threw a fresh Butcher on the front of my enduro with the new Slaughter out back (both control casing, both setup tubeless).
Coming off a Captain, the Slaughter rolls faster in a straight line and has better grip in corners, almost too much (I like the rear to break loose a long time before the front). Climbing traction in loose gravel etc seems the same as my worn out Captain (so not that great), but a smart/skilful climber could easily make it work. Haven't taken it down anything super gnar yet but straight-line braking will probably be fairly poor (but so was the Captain). The control casing on the butcher/slaughter feels heavier and more substantial than the control Captain and other XC spesh tyres. Overall I really like it as an AM rear, way better than the old Purg.