Just got back from Northern Vancouver Island.
I have had no leaks, but my friend's housing did have a tablespoon size leak on his last dive. This was very concerning to say the least. Thankfully, his camera was ok and he plans to do a test dive empty. I couldn't see any evidence of missuse (rings looked good - no hairs, etc.).
The issue with having no on-off switch is not really a big deal. I set my auto-off (in setup menu) to 30seconds, and install the camera. When I go down, I access the menu again and reset the auto-off to 5 minutes. This has been an adequate workaround.
As for the focus, I have been extremely frustrated. I thought I had it rough with manual focus on my Nikonos V. At least I had a focus. After many macro dives, this last weekend I thought I hit nirvana when I set the focus to manual, and shot at extreme close up. Unfortunately, a lot of the images that I thought were sharp proved not to be on my crt.
As for the 19mm lens, I am seeing a lot of blur at the corners. Has anyone else had this issue? I don't think it's do to focus - I am assuming it's cromatic abberation (?). Other than the corners, the lens doesn't appear to be very sharp. Someone please tell me I am wrong. The issue with removal of the camera is accurate - you must install the camera, then install the 19mm lens, then install the dome port. This is all very fine, but you only get one dive with the battery (and card too!), so, who wants to remove so many ports/openings on a wet camera between dives???
My only other letdown with the Aquatica housing is that the shutter release is a button rather than a lever (quiet Ike), and so I can't reach it while using the excellent hand grips (optional). I have since removed the right grip and use one hand grip on the left, and the thumb-grip on the right. If I need two grips while on the move I simply hold the right arm segment. As for arm placement, I moved the angled ball mounts UNDERNEATH the base plate and found this to be an ideal system. I promise to post a shot of this arm setup soon.
The construction of the housing is superb. It's the camera and some of the features of the housing that are worth some thought.