yep, it's the SRD9-C. I bought it from Ricmotech in the USA. Cost a bloody fortune to get it over here to Germany. It comes as a pre-assembled bundle for the T300RS with the GT28 wheel. But they do have other options. What wheel do you have?
Here:
http://www.ricmotech.com/category_s/1856.htm
It does turn with the wheel, and it's attached to the back of the wheel with strips of super strong 3M velcro which Ricmotech supply with it.
It's connected with a spiral cable which Ricmotech also supplies. You have to remember to unplug the cable before the wheel calibrates when you start or re-start the computer, otherwise the cable gets twisted, and eventually breaks. Ask me how I know that
I now have an USB extention cable, and when I turn the computer off, I disconnect the spiral connection cable from the USB extention cable, and wrap it around the spokes of my wheel, as access to the plug on the back of the SRD9-C unit is a bit fiddly. Since I've been doing that, I havn't had any more troubles with the cable. But I have a spare now , just in case. Amazon is your friend
The software is very stable, although to get it to work in AMS I had to install the plugin.dll manually from the AMS Beta. No sweat copying it over though.
On friday I'll be recieving this:
http://simracinghardware.com/product/thrustmaster-t300-dashboard/ from SRH in England. I'm not sure if the SRC9-C will still fit on the wheel, due to the clearance between it and the new dashboard. I'll probably have to mod it to fit together with the new dashboard. If you have any more questions, fire away