Underwood Mod to Denon 5900


Has anyone heard the Underwood modification to the Denon 5900?
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Tombowlus, have you received the modded 5900 yet? I am very interested in going this route and would be interested in your opinion.
No, I don't have it yet. Dan currently has four 5900's in his shop (one of them being mine), and he is working out some additional customization mods for the 5900. They sound very promising, though, and I will be sure to report back once it comes in. The downside to my situation is that, as I had the unit sent directly to Dan, I will not be able to provide any "before and after" type of commentary.
The UDP -1 from McCormack is the best sounding unit for CD that I have heard. I can not rate it for DVD/DVDA/SACD. Though my ears say it does these formats VERY well, I bought it because CD is still my most played format. For this, it betters my Levinson #36, with Sonic frontiers transport.
I received my modded 5900 today, and I must say that Dan does a tidy job! The external power supply (PS 9.0) for the analog tube section and "umbilical" cord are extremely sharp. I'm putting a few hours on it here at work and hope to have it in my system tonight.

Once I've had a chance to break it in, I will reply with my thoughts & observations.