Well, for you guys who are really thinking about getting one of Frank's DACs, all I can really say is that he's got a 30-day money back guarantee.
I've been running one of Frank's DACs for near on 15 years. The first one made a night-and-day difference, and the Ultra is simply outstanding. Maybe mass produced onboard DACs have improved considerably in 15 years. Maybe not. I just don't know because I don't listen to them. Well, I did once listen to the DAC in my HK CDP, and it really really sucks (as in, it's bloody unlistenable). But that's hardly a fair sampling. As they say, once you've been to gay Paree, it's hard to go back to the farm. Or something like that.
Anyhow, if you want a review, read Suzy's in TAS, and consider that she ended up buying an Ultra DAC for her own use after reviewing it