^
I had (still have somewhere I think) the TFB-2 predecessor to those, which came bundled with an Edirol R09 recorder I bought from Sound Professionals back in 2006. They sounded natural and worked well as a simple and easy way to do some binaural ambiance recording. I never really used them for recording music, except a few tests of additional mics used non-binarually as ambiance channels. The primary problem I recall having with them was that they were not particularly well shielded and quite susceptible to EMI. It appears from the description on the page linked above that the MKII version has significantly improved specifications, so perhaps the susceptibility to interference has been improved as well.
Edit- Note that in stating that the earlier-model TFB-2 binaural microphones "sounded natural" to me, that was in reference to a handful of binaural recordings I made, likely due in part to the fact that I was making those recordings with the mics placed in my own ears. Be aware that this is one of the quirks of binaural recordings made with microphones placed inside the folds of the pina or outer ear near the entrance of the ear-canal. If you use your own ears to make the recording, it is more likely to sound natural to you, yet may not sound as natural to someone else who has significantly different shaped ears. This is the influence of the shadowing, reflections and resonances imparted by the unique shapes of our outer ear structures and generally applies to all binaural recordings made in this way. However some ear-shapes and simplified ears on dummy heads may produce less "translation error" for listeners with differing ear shapes than others.
This recording-ear/listener-ear influence is avoided on head-baffled recordings made with the microphones placed forward if the ear, or made with a dummy-head featuring simplified ears or no ears at all. In that case the imaging may be less "wow, hyper-realistic" for those who's match is close, while being more generally correct overall for a wider range of listeners, and work better for playback over speakers. The material being recorded can also make a difference. Ambient binaural recordings that are more about emulating immersion in an audio environment, identification of the things in that environment and the 3-dimensional spatial imaging placement of them, may translate more easily to a wide range of listeners than music recordings which tend to lean more heavily on a perceptual awareness of correct tonality and timbre.