I read these posts with interest, especially subbasshead's blog (and dune article) and various comments.
I am also looking for a durable, professional contact mic/preamp system with good frequency response for recording surfaces for sound design/fx, and to use on my bavarian zither, other strings and possibly on percussion (djembe, udu, hand drums etc) for live looping.
For general information I have an sm57 beta which I tried for percussion but in a live setting its very prone to feedback and seems not to capture any of the real character of the drum. For zither I've had better results close-miking the soundhole with a Rode NT1.
I contacted schaller about the oyster a while back and they basically said they dont have any stock and dont know when they will have. So it seems like the options are an akg c401 if one can be found, a c-ducer, or this which looks similar
Accusound Ultimate Sound Reproduction
Subbasshead how did the trial of that barcus berry work out? Would it be suitable for general purposes do you think?