never had any personal experience with THIS deck, but had experience with previous kenwood models and always found them to be sturdy and good value for money (really long lasting without the ribbon and grounding issues of the pioneer) can't speak to the sq aspect of the deck as i have no experience with that, but i was satisfied for everyday listening. the eXcelon series supposed to be the best/highest line of kenwood out so it should work very well for you. actually it supposed to have time alignment and a whole set of features. from first glance it looks like a really good buy.
reviews from the net that you should read:
http://www.ltparis.com/2009/06/27/revie ... -kdc-x693/
http://signature.crutchfield.com/s_113K ... ml?tp=5684
the manual:
http://www.kenwoodusa.com/UserFiles/Fil ... dcx993.pdf
youtube links:
http://www.youtube.com/watch?v=2Yo9uWVNpHg
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anything else you on your own.