jumped on to the DacMagic 100 boat as well - there is so little review besides that one on Angel and here of course.....
I actually bought two - one initially for my father who needed a DAC and out of curiosity I bought a second.....using it with QED Precision USB Cable 3m length (yes just the maximum Cambridge Audio manual suggests).
People that claim you can't better the Squeezebox Touch's internal DAC have clearly not paired it with the DacMagic 100 - much more detail, bass much more pronounced (maybe boomy to some)....but detail is there...
I've used it with Foobar with ASIO as well...test tracks include Sad Lisa (Tea for Tillerman 192), Hotel California/New Kid in Town (192) - wow is all I can say - much richer/refined.....
There is however one bug if I may add - theres no hum with supplied powersupply (running it here in UK) but I noticed when the Foobar playlist is empty - theres a hum/feedback noise through my speakers - only happened once but is it possible that because theres no sound file theres no 'load' if you will
Other than that - happy camper.....although I will probably still use it with the Touch out of convenience of not having to trip over the 3m usb cable to my laptop