Last Saturday I received Christian's wire harness and spare plug in the mail. Although I have not had a chance to put the harness into service, I was very impressed with the quality of the construction. In terms of of construction quality, It seems to be at least on par with the OEM harnesses. As he already mentioned, it does not include the mic in line, ISO connector, or tuner connector. The fuse holder is also different, being a standard inline version rather than the big black Autoleads variety. A fuse was included though.
Dealing with Christian was also pleasant. If he makes another run of these things, don't hesitate to join in.
If you want it to break, buy Sony!