I had a set of mutants on my DRZ400SM.
Mainly bought them for riding through the winter on the greasy muddy back roads I use to get to work ( rather than a road based tyres on the super moto rim) but then ran them through the summer and had a ball with them.
They are soft and very grippy even in the wet and look cool because of they look like a set of wet weather racing tyres.
They don't last long (maybe 2000 miles for a rear) but the grip is excellent.
I would buy another set but not for the XTZ!!!