11 speed (11-13-15-17-19-21-24-28-32-37-42). Though slightly heavier than the 11-32 cassette, the 42T gives me a bail-out cog and more importantly -- a better chain line when wuzzing uphill in the 32T. The lockring is aluminium (less weight, more care). Shifts well.
I'm using the cassette with a KMC chain, 32T Praxis front chain ring and an mtb rear mech (both XTR RD-9000 medium cage and the XT M8000 medium cage work). To get the transmission to work on a road bike (which has shorter chainstays than a mountain bike), I had to play around with chain length and the 'B' tension screw a bit, but it works well. Tip - Fevibond (not Fevikwik) the adjustment screws to prevent them loosening or falling off. WD40 loosens the glue when one needs to adjust the derailleur.