RE the previous review, I formatted this card in a Canon 5D and found that it provided the advertised capacity. I typically use Lexar 300x cards and am satisfied with them, but I decided to try the Kingston Ultimate on the strength of its first-place recommendation in a recent review:
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Into the bargain, the Kingston is quite a bit less expensive than the 300x Lexar.
I have gone to 16GB cards for the capacity but have not tried 32GB cards because, as of this writing, there are none fast enough. The real speed stops at 16GB, and slower cards (e.g. the "133x" class) will stop the camera with rapid buffer fills during extended shooting bursts. There really is a significant difference in burst length between the 133x cards and the speed-demons. As to capacity, with the 5D I can get about 900 RAWs in 16GB -- more than enough for an entire wedding, almost enough for a dance performance (which is where I need the speed). If burst speed is not an issue for you, a slower but more capacious card may be a more cost-effective choice.