I purchased this to replace the 12-25 Campy Chorus cassette I have used since 2005. To me, it seems to shift even better. I have also enjoyed the lower gear ratios while climbing the road to our local ski area,at 9300'.
I both race and ride with this Cassette as part of the system i have on my race and training bikes. I have never had a mis shift chain slip or any other situation. I believe it is important to use Campy shifters and deraileur with this cassette. I don't need to go to an 11 speed unit. while i live in the flat country i do train on hills and go to places where there are hills. Training is sometimes going up and down the local multi story car park early in the morning before the cars wake up