I don't think I can say anything that hasn't already been said. I have gone from the canon housing to an Ikelite to the Recsea. I could have saved a lot of time and money by just going straight to the Recsea. It is a lot of money for a housing but its really worth it if you plan to use your camera much.
One tip, if you configure your setup with a lot of accessories, you need to watch buoyancy. Once the camera/tray gets heavy its hard to operate with just one hand, which is possible once its setup and neutrally buoyant.
The shutter trigger on this is by far the best. The button operation is the best. The design and build is the best. Dual flash optical sync ports is THE BEST!