I own one (2yrs.) and think is is awesome, especially with NOS tubes. I have heard the MKII as well, and it is really nice (almost current REF2 level). I give a thumbs up!
I did the same thing with the 6H23s from Kevin at Upscale with the same results as Gmorris... two thumbs up!! Also did the VT-100. The 6H23s do not work well with the DAC3MKII however. I think this has also convinced me to wait with the MKII upgrade... You can replace with these tubes 25 times (at current rates vs. the cost of ARC OEM tubes) before you will break even with the expenditure. There is also another level when some key capacitors are removed and replaced with Signature hotrod type D Infinicaps (use type S to mimic some of the other competitors sound).
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