I just tested the card again with lens cap on. I got 90 pictures before camera started to stutter. Only slightly better than when shooting regular image.I wonder if their "laboratory tests" were just firing frames with the lens cap on. All black frame once compressed has a smaller file size.
The camera does still keep on shooting at reasonably rapid frame rate, but with frequent stutter.
I guess practically speaking, you can keep shooting a prolonged action event and get plenty of pictures.
But it bothers me that Delkin would make the claims that they did. I really see no difference in performance at all between the older 128GB Delkin Black and the newer 150GB card.
At least with the new card they are giving some extra GBs and they have significantly reduced the cost of the card from $230 to $180.
If you have the older Delkin Black cards, unless you need more cards, I see no reason to buy the new card