I got my 360 elite in 2007 and it only failed the day Mass Effect 2 came out (Crashed during gameplay) and due to the error being an E74 error I had it fixed for free and no problems since.
So in all I have had the 1st 360 I ever owned.
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Edited by Faux-Fangs: 4/7/2014 5:01:00 PMI've had just one since 2008ish. Edit: 2. My old one still works mostly. It has trouble reading discs these days though.