Comments about SanDisk SanDisk 16GB Extreme Compact Flash Memory Card - Up to 60MB/S Read/Write, UDMA Enabled Pack of 2 Cards:
I was looking for a spare card, and Sandisk is kind of my gold standard. So when a two pack was listed for less than what I originally paid, the decision was easy.
They came in individual retail packages and perform as expected, AWESOME!
These will compliment an 8Gb Extreme IV, and a 4Gb Ultra II. They are significantly faster than the Ultra, and comparable to my old Extreme. I shoot with a 50D, so I doubt I'm reaching the limit of either Extremes.
After having two other cards fail on me (thank you very much airport X-ray scanners), I've gotten used to traveling with a couple spare.