I upgraded to a 722K almost 2 years ago and it has been chugging away flawlessly since. Other than some buggy SW updates from time to time. To keep the heat situation down I use this,
They are nice and quiet and keep my temps LOW! Even during this summers heat wave my unit never went above 114 degrees and averaged 96.
Wow is that overpriced. One of these does just fine- http://www.ebay.com/...=item4609b77509 It runs off the 722 usb port and it doesn't even need to be set on high.