I recently wrote a detailed review of the Canon 7D and Aquatica housing which has been published at the Underwater Photography Guide. The article expands on my first look blog post and includes my ongoing view of how the 7D is performing for both stills and video shooting applications.
Feel free to contact me if you have any specific questions.

Damien,
Just wondering how you were able to install the moisture alarm? I purchased the alarm with a 7D housing, but can’t figure out how to install it. The back of the housing is too small to install it in the way shown in the instructions, and I’m kind of at a loss where to attach it.
Thanks,
Mike
Mike,
I installed the alarm in the spot provided (ie. bottom left of the housing back when look at it from the inside). From memory it didn’t sit perfectly but I just stuck it there with the provided velcro and I’ve not had any issues.
Regards, Damien