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My bearings in my EC and ZS cups haven't lasted well at all. They do go through some horrible conditions tough.
Alternatively the Cane Creek headset in my Bird I had before lasted really really well. It was still like new. I should have gone hope straight away. I went brand x full, then got a Nukeproof lower and just did that, then thought I 'upgraded' to superstar but alas here we are. You only have to take a pair of bearings out of a set of hope hubs to find even when they are worn they hold up really well and are great at resisting corrosion.
Nah Shite bearings. Cane Creek is where the cheaper quality is at.