I’ve got some 2005 MXCs which are still working but have a bit of corrosion from abuse on the carrying the kids bike/salty roads. I may have to bin them as broken forks are not good, particularly with kids onboard.
I also have some 2001 Z1 BAMs which have no rebound adjusters anymore, are very scratched and have had 1 new set of bushes and 2 or 3 new sets of seals (only needed due to a scratch on the stanchions), but owing to their simplicity still work fine (well I assume they did, I loaned the bike to my neighbour last summer, need to get it back to do SSUK on this year I think!).
Also have a set of 2015 44s, which are more complex, wore through the anodising in about a month when new (Windwave sorted me with a new CSU which has been fine), and I’ve needed to service at normal rates 🙁 – plus I need to sort the travel adjust as it stopped working a couple of years ago. I think simplicity is the key to the Z1s, an oil bath/damper and a pair of springs will last a long long time compared to a load of lockouts/complicated air springs etc.