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The issue isn't that the buttons themselves don't work, it's that the acrylic compresses a couple mm when you get very deep and some of the buttons with tight tolerances/minimal gaps between the pegs and the camera body are placed into contact with the camera, placing them in the "pressed" position.Depth comes into play when deciding. Ikelite is a 130' housing with a 200' rating. While it doesn't crush at 200', none of the buttons work. If you planning for deeper photography, you will want a higher end housing.
My last Ikelite housing was for the D800. I quickly discovered it was NOT good for wide angle FF and switched to Nauticam. I believe they have since redesigned their entire port system to address this and the flimsy attachment system they had in the past. My buddies still using Ikelite housings are happy with them, but I've moved on.The depth issue is a thing for me as I have a tendency to wander down below 200’ from time to time. I’m going to go with the Nauticam I think, I have had button issues on other housings and it is annoying. I think the piece of mind of a better quality housing will make diving with it more fun. I’d hate to foood my brand new camera in Bikini Atoll or Truk on a deep wreck!
My last Ikelite housing was for the D800. I quickly discovered it was NOT good for wide angle FF and switched to Nauticam. I believe they have since redesigned their entire port system to address this and the flimsy attachment system they had in the past. My buddies still using Ikelite housings are happy with them, but I've moved on.
The other >disturbing< thing I experienced with the Ikelites was an occasional ear-splitting CRACK sound the housing would occasionally produce at depths for 100 feet or so. Nothing ever happened that I could find, but it was terrifying when it happened.