Jut make sure you get 2.0 Thielert diesels with it, i just read the december article in aviation consumer and diamond says they had 22 in flight stoppages of the 1,7 diesels !!! 22 ? Blimey!!
Did you read the whole article?
Whatever your personal view your quote misrepresents the article - neither fair to the authors or Diamond.
Significantly the authors conclude:
That they dont know whether the "failure" rate of Thielerts is higher or lower than Continentals or Lycomings - because the data does not exist. Moreover Diamond suggest they do have the data and reliability is better.
In a DA42, what would be the limiting factor, fuel or battery life?
Clearly the battery - with no battery power the FADECs will fail and so will the engines. A conventional system has two fuel pumps - if they both fail so will the engine. The DA42 has two alternators, in addition to the main and backup battery - if all fail so will the engines. That might be a good reason for not flying the aircraft out of sight of land for more than three hours but that is hardly a typical mission. Moreover the reliance would seem less dependant on the redundancy of the systems than a traditional engine on just two fuel pumps.