Suntour won't honor any warranty originally offered (guess why). Chris King makes great headsets that will last a long time. Suntour is a loose-ball set-up, demanding more maintenance over Chris King's sealed bearing system.
However, why the hell don't you buy something more effective (price-wise, that is) - say, like a Tange headset?
Personally, $130 for a Suntour headset is pretty stupid when there are better options currently available at a lesser price. But, there are a lot of stupid people out there.