I thought that I preferred the 8 Gig size before I got this 16G. Now I have changed my mind. 600+ RAW files in a morning is hard to do, so I just don't have to think about swapping the cards while I'm out in the boonies.
Perfect size and speed for the way I photograph; It works great in my D700, and downloads quickly enough to my laptops; I shoot RAW files on the road mostly, shoot early, download and eat, then shoot later and download again; So far, I have not had to put in a second card while shooting this card
None so far; I have 2 8 Gig cards just like it and they have never given me a problem