My experience matches many of the satisfied users above.
Setup is XT medium cage mech, Superstar narrow-wide chainring and KMC chain. I’m happy with the shifting and also the gear range. As mentioned, the anodising does start to wear off after a few rides.
However, on the 6th or 7th ride I managed (and I don’t know how) to severely bend the 42t gear. I’m assuming it was a rock strike as we were caning it down some of the Peak Districts best descents. I have never actually broken a cassette before.
The good news is I bought my cassette from Charlie the Bikemonger and I emailed him about it, asking if he thought there could be a warranty claim. The imported said yes and Charlie sent out a new cassette. All I need to do is swap them over and send the old one back to Ison.
Great customer support from both Charlie (who made sure I had the new one in time for this weekends ride) and Ison for being quick to resolve this for me in a satisfactory manner. Assuming this is a one off I’d happily buy another when this one wears out.