Taken from a headset thread a few days ago “My NP headset lasted 3 months, crap bearings and seals. The replacement Hope one is still perfect 18 months on.”
Stainless bearings, great seals, split crown race for easy fitting/removal.
I just bought another pair for my Nicolai last week. I had to shope around to get the top and bottom I wanted. Rutland and Winstanleys, about £26 each posted 😉