..............Having fun now,
Welcome to the fun! I'm still learning all the optional tweaking features of the camera. I'm also interested in how others are selecting features for this camera specific to underwater situations. Maybe this should be started in a new thread.
I'm little disappointed that Ikelite decided to again (like in their 5Dm2 housing) to ignore the multi-use toggle control, which I have grown to love to select various custom functions. Aquatica (and hopefully other future housings) have this. It is nice to have access to all camera controls in a housing.
I do see that with the 7D I will have so many options in features that my old brain is the limiting factor. I think I will need a slate or laminated flash card to help me. My brain goes even more stupid when it hits the local cold water and additionally needs to think about checking basic safe diving procedures.
I know, many of you would say: "Dive warm, calm, clear waters only", but that be too easy, too expensive and no challenge.... [ducking and running now].