The bearings in my FSA Orbit went weird after 18 months because they're roller bearings. And other non-cartridge bearings have only one fate. Death! Initial cost usually dictates their lifespan. One exception is Campagnolo Record, if they are loved and well maintained. But, they can command as much money as a King now.
In my opinion, cartridge replaceable bearings are best, because the headset can practically live forever due to the bearing being the only thing that wears out. We all know these are fully available over the counter at little cost.
(Imagine if all our Ti Bottom brackets didn't have replaceable cartridge bearings! I've given my main bike new BB bearings every 2 years for the last 10, and it's like new every time. I see no reason why it shouldn't last another 10 , and so on).
Two most important factors, the seals and the bearings.
Chris King isn't the only one making this type of headset.
1990 Marin Team Titanium, 1991 Marin Team Titanium, 1993 Marin Team Titanium, 1994 Marin Titanium FRS, 1995 Marin Team Titanium, 1995 Marin Eldridge Grade, 1996 Marin Team Titanium, 1998 Marin DH FRS, 1999 Marin Team Titanium, 1999 Marin Mt. Vision Pro, 2000 Marin East Peak, 2002 Marin Mount Vision
1988 Concorde Colombo, 1997 Colnago Master Olympic, 2005 Look KG481-SL, 2009 Look 586
WANTED: Marin Titanium - pre 1990, 1996 FRS, 2007 25th anniversary