The twin-splitter was banned as too noisy (drive-by rather than in-cab noise)
Any one remember the Eaton S16 synchro box that came in to replace it? Nice action by all accounts but there was an assembly problem with it that meant that all the early ones failed, so MAN and the Brit truck makers dropped it for ZF.
Eaton is now trying to get back into the European heavy truck transmission market,which should at least keep ZF honest with its prices.