Just got my DW Collector's Edition in the mail and WOW- this thing is amazing!
If you can get your hands on one I highly suggest it! As odd as it sounds- even if you have no interest in playing the RPG- the case is too good to pass up! Not to mention the book is full of general 40k fluff as well as detailed info on the Deathwatch Marines- their history, chain of command, mission ect.