I just dove with a D9 this past week off NC...wreck and deep diving for my AOW. It worked great. Just make sure the computer and the transmitter are on the same side of the body...I have mine mounted on my right wrist and the transmitter on the right HP port of the 1st stage. It worked flawlessly for the 5 AOW dives.
I was a little hesitant about even bringing up this type of computer with my instructor....he's totally DIR...but he said go for it and assured me to trust Suunto's record. He has over 500+ techie dives so I gave it a shot and it all worked out reeeeeeeeeeeal nice. My only gripe is that the alarms on the D9 are a little weak.
I dove Nitrox too and it worked great programming in with a 50% RGBM, 30EANx, and 1.5 Opp. With this configuration, I was middle of the road in conservatism. His Uwatec alerted him for Deco before my D9 did (but hey, he's totally hard core and was a super guy to train with).
From what I can tell so far, if you use fact settings then you are very conservative but you can modify/adjust the EANx settings to your need to make your dive a bit more liberal. However, you MUST know how all this works through theory and charts beforehand.
It's a beautiful piece of equip too!