I did some A/B comparisons between the two usb to spdif converters Musiland 01 usd and the TeraLink-X usb to spdif and I found that I slightly prefer the TeraLink-X. The latter seems to have slightly sweeter and more extended highs and better transparency.
Howvever, the funny thing is that I hear more differences when I switch between digital cables.
The best BNC digital cable I found is the 18ft. Belden cable from Blue Jeans which is cheap but performs very well. Compared to the other cables, it has a huge and believable soundstage. The depth in the soundfield is also one of its strengths.
For now, I let the TeraLink-X burn-in and I will do more A/B comparisons in a few days to see if burn-in improves or not the sound quality of the TeraLink-X.
Anyway I think the TeraLink-X sounds so good because it uses audiophile grade components (1ppm clock, Oscon capacitors, ...). I wish that someone offers a mod to the Musiland Monitor USD 01 because I think that with the help of better grade capacitors/power supplies, a higher quality clock, and a true 75ohm bnc output, it could be a giant killer usb to spdif converter.
Maybe the guys at Pacific Valve can offer something like that ?