BloggingITGuy had an unfortunate problem with the 7700 that he couldn't resolve. There are lots of us who have them (with no issues) and love them.

Here's a great article on class d http://sound.westhost.com/articles/pwm.htm
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Outlaw Audio 990
Outlaw Audio 7700
OPPO BDP-83SE
Playstaion 3
Panamax M5400-PM
Sony VPL-VW60
Stewart110" FireHawk G3
North Creek Music Systems CM-7's
Dayton Titanic 15" MKIII subs (2)