It could be said, one set of CIEMs are functioanal, while the other are pieces of functional art.
The first set of CIEMs were built in the USA (Not by the Wizard)
The second and third set of CIEMs were built by the Wizard while in Thailand long before the days of Heir Audio. (The third set were built for Sheena Melwani http://www.youtube.com/user/SheenaMelwani)
The 4th set, was built by the Wizard while in China..... It is the passion and skills of the artisan that determine the result, not the location of origin. Now that Kaiser Sose, dB Cooper, and the Wizard no longer practice their craft at Heir Audio what ever products come out of Heir Audio will be built from un-tested hands.