I purchased a Nexus housing for my D100 a couple of years ago, primarily because about a half dozen photographers in my regular diving group have used them for years, beginning the model for the Nikon n90. They reported few problems, no floods, etc. And I must say I've never had a problem with mine either, through several hundred dives now. The finish paint may nick or scratch over time, but no corrosion or other problems. The Multiport system is wonderful for 60, 105 and 70-180 macro lenses. Nexus also offers a good range of dome ports, too.
Since so many of my group use the Nexus, we have plenty of expertise and can interchange knowledge, lenses and ports easily.
The housings are light and compact, easy to operate and seem to be built like tanks. Marine Camera Distributors, a Wetpixel sponsor, is one of the Nexus distributors in the U.S. and also provides excellent support, including overhauls when needed at a reasonable price. They are also easy to work with.
Anyway, based on my own experience -- and that of many other users that I know -- I wouldn't hestitate to recommend Nexus housings.
PS: I have NO interest in Nexus, personal or otherwise, financial or otherwise ... except for my own housing! I wish they would offer some housings for Canon DSLRs.