I had the chance to bring a DAC IT home for a very short listen a few months ago, and thought it made a nice improvement in my system. I did not do any blind testing, however I hooked my Imoded IPOD through the LOD out into input number one on my Woo Audio WA5LE. Hooked my Oppo 93 into input 2 and the digital out of my Oppo 83 into the DAC IT and then into input 3 of the Woo. I have a few CD's that I have two copy's of so I placed them into the Oppo's and cued up the same album on my IPOD. (Every thing on my IPOD is in WAV format) I made sure all three were synced and listened to each one while switching inputs on the Woo. In the past I have done the same thing with the Oppo's and the IPOD and have found the IPOD to sound thin, a bit lifeless, and hard to listen to for extended periods of time. The Oppos were close to one another, but I liked the pace of the 93 slightly better then the 83.
With the DAC IT in the system the 83 was the clear winner. The sound as a whole had more authority, drums hit harder, bass was deeper, vocals more extended, but did not sound shrill. The sound stage became slightly taller, deeper and wider, but the instruments and vocals within this envelope were more defined. I know it has been said a million times before, but it really was like someone had cleaned a window with Windex. The haze that I did not know was there, was gone.
I was so impressed with the DAC IT that I placed and order for the Grand Pre without hearing it.