Hi all! What you guys are talking about is very interesting! I bought both GT1 head (the yellow one) and the OPS head (the orange one) from eBay. They are working very well with my DIS v55 amd SSS v33. But only one problem makes me feel very uncomfortable, that is the BMW officially approved battery charger, in the SSS, it clearly says connecting to a battery charger is a must before coding. In Realoem, I found a BMW battery charger with part number 61432154949, I wonder if this charger can be used for coding cars. Can anyone provide some help please?
By the way, GT1 head works very well on my 12/2000 made X5 4.4i, but does not work on my 04/2008 made e87 120i. When I connect the yellow head to my 120i, it promps up with message to ask you to use OPS head (the orange one). When I use OPS head to connect to my X5, it promps up with message to ask you to use GT1 head. Interesting.

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--2004 E53 X5 4.8is - ECE version; right hand drive; Located in Hong Kong; ext. black sapphire metallic; int. leather black; adaptive dynamic bi-xenon headlights; 16:9 onboard monitor w/o navigation; 20" genuine BMW Y-spoke 214 wheels with Bridgestone Dueler H/P Sport tires; Int. rear view mirror w/ compass.