I've done over 20 dives with this housing with over 2000 photos and 100GB of 4K video and I'd say you get what you get pay . Immediately the scroll rubber of the modes started to fall off. I've glued it on and so far it's working, although I've noticed that it's started to tear and will probably break soon, rendering the whole case unusable. The main downside, in my opinion, is the lack of a button on the front. The a7ii doesn't let you adjust aperture and shutter speed, but the a7rii does, but the mode dial has a button at the top that you have to press before you can turn it, which then doesn't work. I'm not sure about a7sia. You can go to the a7ii in the settings to set a rear shutter speed or aperture and you can do a DIY modification on the a7rii but essentially you have a semi-working system unless you want to modify the camera and the warranty cancel. But you're taking the camera underwater, so if it gets submerged your warranty won't cover it anyway. For me it was ok. Also note that this case doesn't have an optical cable for the flash, so you'll need to hardwire the system. The dome is a great addition and I would recommend buying it. Especially since you are limited in size with your lenses (I use a kit). In addition, there is no manual focus and the a7ii has problems under water. I usually take 3 to 5 shots of the subject to get good macro focus. I often take the hull to a depth of 30m and the deepest I went was around 32m. No problem. However, after one dive I had to remove the travel dome and when I put it in the tub with the original lens cap, the hull flooded. I took it apart, cleaned the o-rings and put back the domed connector and no leek, but now the sensor is broken due to flooding. I couldn't figure out why it was flooded as I didn't find any dirt, sand or hair on the o-rings, so I'm guessing I didn't tighten the small screw enough. Another issue was the on/off button, which is a bit flimsy. What worked for me was turning on the case and camera before I put the camera in. After I turn it off it works fine. But lately it's become a problem and I have to flick the switch harder to turn it off when it's in the case. It's a pain when you do 3-4 dives a day and want the battery to last so you don't have to take it out between dives and risk flooding. Overall I'd say this case is good, especially for the price, but it does have a few major drawbacks. If you already have an a7ii I'd say get it, but if you're thinking about buying a whole system with a new camera and are serious about diving and photography then you might go for the gun based on it of Sony's underwater autofocus problems and possibly a cannon in the right case.
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