I just bought an OPS head to go with my EDIC (yellow head) from the Ebay seller atechpro. I bought my EDIC from him and haven't had any problems with it at all, I can recommend him.

However I bought a Unix based HDD with DIS V57 and SSS V32 from the Ebay seller 2elite4 and whilst he seems honest he won't give me the Unix root user password so I can shut the system down correctly.