I've had 3 xboxes RROD on me... this was pre-"fix" though.
I got my first in 2006 Christmas. 7 months later it broke. I used one of two warranties. 9 months after, it broke again. Used my second warranty (which was about to expire). Third time, I bought a new xbox and that's been with me since.
The thing that is bullcrap is now they will fix RROD for free... My most recent box is dying but it ISNT the RROD problem. Sometimes it cant read my discs, even brand new ones. Just my luck.