Seeing as they are in compliance with the CEA 2006 ratings standards I would suggest that they do rated power at the very least.Whether or not they exceed given ratings I couldn't tell you but I'd wager you'll get at least what they claim to do //content.invisioncic.com/y282845/emoticons/fyi.gif.9f1f679348da7204ce960cfc74bca8e0.gif
Kenwood did take a turn for the worst a few years back - most notably around the time of the ill-fated D-Mask+ faceplate mechanism (that they strangely brought back for the KDC-X689 but no other model?!?) and after that fiasco they lost much in the way of brand loyalty and reputation.
They've been working pretty hard, though, since then to come back to where they once were.