I use Ikelite for my D800E.
It was good enough for me to win the Swedish Championship in Underwater Photography 2015.
Mine has:
* Vacuum system
* LED warning LED
* Mini DOME (with sharp edges)
Works great with Tokina 10-17 + Kenko 1.4x, = FishEye zoom for full Nikon format. Very sharp!
On my rig I have attached (without anything interfering with the other)
* Dive Computer
* Compass
* A Focus light
* A Dive light
* Two individual Strobes (DS161) on individual arms.
And well balanced in the water using Stix Floats.
The LED-light on the strobes DS161 are so strong (500 lm) that it makes using a Snoot very easy, and it can double for a video-light, focus light (auto-switches off when firing the strobe), strobe pointing light, dive light etc and uses very little of the strobe's battery.
Yes, it leaked once (during the Championship!), but first the Leak Warning shined RED and then I checked inside the housing. As it is transparent I could see exactly where and how much water there was inside. There were only a few drops and as I also has the great Leak Insure sachets I slowly descended. It turned out that I have forgot to put the cap on the vacuum connector. Opened up the housing, changed sachet, dried out the drops,
So, I was clumsy (but hey I was under stress, it was the Championship) and forgot the lid, but the leak warning system and the fact that the housing is transparent, saved me.
Note, that there is another version of the vacuum system that has a build in warning that warns when it looses pressure. I usually check the pressure before the dive so I felt no urge for it and went for the cheaper solution.