I've just uploaded a product review of UWCameraStuff's Housing Sentry on my site at - http://damiensiviero...-sentry-review/
I originally read about the product release on Wetpixel and didn't really find much else about the product. I thought I'd take it full circle and put a review up of my findings.
In short, the solution was extremely easy to install in my Aquatica though perhaps no so either with other housings (ie. you may need to drill a hole in it). The operation is very simple and for most people it's pretty failsale. If you do deep dives like me though (e.g. past 50m), ensuring the plug is always inserted is a must but I don't consider that such a burden.
Whilst not unique in the market (Gate and Hugyfot have similar solutions), the Housing Sentry is a clever design that can be installed in any housing. As I don't like dunk tests and often put my gear through hell (in and out of the water), I'm a big fan of the vacuum seal approach and very much like the positive acknolowdgement of the housing seal integrity.
I've sadly had a flood in the past and feel this would have identified the issue had it been installed before that fateful event.
Edited by betti154, 20 December 2010 - 10:39 PM.