I’ve got some nasty corrosion going on in my one year old Acros. It’s just press fit industial bearings so I can easily replace them but since it came with a two year guarantee I’m a bit miffed. The new version has stainless bearings and is five year but mine had only a 2 year guarantee and judging by the state of the bearings they are non stainless.
My Hope was okay after 2 years – the sealing is not great but since the bearings are stainless the just needed a clean and regrease.
I had a King which was good for five years but scored my steerer tube.
FSA MX Pro was good for two years, and Orbit Extreme was good for five (but only just).
All of the above was with regular clean and grease – every 6-12 months.