Noctua call this their flagship model, their premium product, meaning you cannot buy a better air cooling Noctua product. A lofty claim if it wasn't from Noctua themselves, but basing this on their D14 means they might just know what they are talking about.The D15 in two fan configuration is around £70 in the UK currently, which is a lot of money. It means the flagship model has a flagship price, so in a world of AIO Coolers and a vast air cooler market, this thing needs to be good. Being the claimed flagship of Noctua, it needs to be even better than that too!