I got two of the Nanuk cases on sale for $99 each from amazon. At that price, they were definitely worth the money. At the list price of over $200, I think probably not. They are made from much lighter weight material than a pelican, which I think means they're likely to be less durable. Also, if you pack them full, you can see the lid bow in the middle under the pressure, which means the moisture seal is not as impervious on the sides. Despite this, I did test mine with the garden hose and couldn't get it to leak. However, it's clearly not as stout as an equivalent pelican.
The two-stage latches, however, are very very nice and a big improvement over the pelican ones. I've never had a problem with the "knuckle busting" latches from pelican, but they do often require two hands to open. The nanuk ones are easier.