So the m2tech is (much) better "straight out of the box?" How is it even possible to make a comparison to the Musiland and Teralink converters without an a/b test? Are you basing that opinion purely on memory? I hope the m2tech lives up to the hype but there are far to many flavor of the month products on this forum.
As for making a comparison, I did an a/b test with the Teralink-X. My method was to listen for a few different songs I am very familiar with using the Teralink-X before giving a try to the m2tech to get used once again to the sound of my system. So purely speaking, there was only a few seconds of gap that took me to switch the digital BNC cable (I used the same cable to make a worthwile comparison).
Anyway, all of those precautions were not necessary since the difference was very easy to spot. I will go more in depth with the description of the sound later : I already have started writing a review of the 4 usb to spdif converters I currently own : EMU 0404 USB, Teralink-X, Musiland Monitor and m2tech Hiface.