I've been using the Meikon brand of that housing for around two years now, and I love it. It was some of the best money I've ever spent. Here is a quick review I did:
and here's a series of water images I started last summer, many using the housing with my X100s.
http://www.fluxionphotography.com/p37290009
For those asking, the housing is designed for the 100s... I think the buttons layout on the 100 was similar enough that it would be okay, same with the t, but you may not be able to access everything. I recently purchased an X100f and while it fits in the housing safely, and I can adjust the shutter speed and press the shutter, nothing else lines up at all. I'm hoping they'll make a new model to fit the f - it would be nice to have full access to the camera and all those extra megapixels as well.
fluxionphotography got a reaction from Curiojo in Underwater case for X100(s/t)