Only as maintenance free as the autobox. As far as a fleet profile owner is concerned you never need to check the chain, change the ATF, replace a clutch etc. For those of us that keep them longer however...
Hmm. In addition to the lovely chain location, there does seems to be a great deal of plumbing attached to that engine with twice the chance of turbo related misery.
In terms of longer term ownership, petrol engines with natural aspiration must start looking increasingly attractive.