I had bought a set of four for my Seat Ibiza 2014 1.2 tsi, even though the manufacturer claims they are longlife and I was hoping for over 60,000 kilometers, one of the four broke at 12,000 kilometers. I bought another one to replace it and I will come back with an update. It could have been faulty or an imitation, I don't know.
However, the previous ones I had were Bosch (which are almost 30-40% cheaper) and they lasted over 50,000 kilometers. In that set of four, one broke, so I switched to NGK with a new set of four, but...