I have the RME ADI-2 DAC and it really is a fantastic unit. I tested it against some DAC's at twice and 3X the price and the RME beat them all. Price and feature set is unbeatable. Plus there are features on this DAC you won't find in most DAC's. Don't know of any DAC's in the 1K category that have a 5 band Parametric EQ and a dual EQ function.
I have heard good things, the AKM chips seem to be more "Relaxed" then some of the ESS Chips, I might go demo the one my local dealer has against the Wadia in the system now.
What did you test it against? And what is your amp/speaker setup if you don't mind me asking.