I have this combo, though without the beefy power supply (that'll be next year's upgrade, I think).
Even without the PS, it sounds great. I took a little gamble on this one because I hadn't heard the home module before buying it; at the meet Tyll had one with the Max module in it and one with the base Desktop module in it, but not one with the Home module. It's not quite as good as (my memory of) the Max, but it's markedly better than (my memory of) the base Desktop. If I were to guess why it's so much better than the Desktop, I suspect that's the Class A biasing at work. It's not a "split the difference" situation, it's closer to the Max than the Desktop.
In particular, it's very smooth and really cleans up the grainy-ness I sometimes hear in the HD595s without sacrificing detail. It's a teensy weensy bit on the warm side for me but I think most around here would consider that a positive.
The one qualification I need to make here is that this is my first "serious" headphone amp, and I've not heard much of a variety in this price range. Thus, I'm not in a position to say how it compares to others near competitors. I know, that doesn't stop a lot of people from coming to strong conclusions, but I feel the need to be up-front about that.
Now, on to the DAC. The DAC is simply terrific. That's what really got me seriously thinking about this, as the Home DAC in the model at the meet sounded very nearly as good to my ears as the Meridian CDP. There's something about the Cirrus/Crystal family of DACs that rubs me the right way; my HT receiver also has a Crystal chipset in it and I love it for Redbook. I think if the analog stage is done right, which it certainly appears to be in this case, there's something very pleasing about the outcome--very accurate and detailed without being cold. It's also great to have both TOSLink and USB (and coax, though right now I'm not using coax) so I can have both a changer and my computer hooked up to it.
So, I'm a happy camper. A definite thumbs-up from me.