I've had mine on for ~30,000 km
they work as advertised. Mine don't seem to hold grease for long due to a slight gap between the boot and UCA. But they have zerks so no issue.
Their reminder emails help too!
Put them on mine a few weeks ago, took the slight wobble out of my steering wheel.
Have just about 30000 miles on mine.
They've been awesome. 4+ degrees of caster easily and nice and steady on the highway.
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