I have the HD550 New housing for the SONY HDR-CX550.
Have the first test's done in the indoor pool and fully enthusiastic. The housing has a new desing, nice and small, super OLED display. A super wide-angle equivalent of 92 ° viewing angle. Did the housing with the additional option bought white balance. This button is super easy to make the white balance, I recommend any additional white balance function. The case is super easy to use from the handle.
And the whole case for just over 3000 €
I am fully satisfied with the housing HD550.
http://www.sealux.de/s1e.htm

I will soon have a light system to buy who has experience with Sealux or other light equipment?