Air-matic suspension , HVAC as well I believe series 11 update did not suffer electrical issues that series 1 had . I have been told they have rust issues that need to be checked. But light years more reliable than W140
Hi Mark I believe there is no comparison in reliability . As for air matic struts I posted link on company once in US that rebuilds them on exchange at reasonable prices.
Arnott Inc no longer ship to Oz, but there is an ebay seller that supplies their rebuilt struts at the same price they charge with reasonable shipping prices, I'll try and find a link