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I have this Sandisk Ultra 32GB class 10 30MB/s SD card. I have to say I am totally dispointed. It's SLOOOW. I did two speed tests. First test was performed on a computer using a software named "CrystalDiskMark". I ran the test with 3 different SD cards on the same pc with same equipments and same setting. Results: Sandisk Ultra 32GB class 10 30MB/s SD card, Read 19.93MB/s and write 11.99MB/s. Sandisk Extreme III 4GB class 6 SD (5 year old card), Read 18.67MB/s and write 16.67MB/s. Transcend 16GB class 10 SD (8 month old), Read 18.74MB and write 17.25MB. Second test was performed on Canon T3i DSLR with the same 3 SD cards tested above. In this test I set my DSLR to burst mode and TV mode with 1/50 sec. Within 30 seconds interval, I want to see how many pictures in RAW format my camera can shoot. Results: Sandisk Ultra 32GB class 10 30MB/s, 24 shots. Sandisk Extreme III 4GB class 6, 34 shots Transcend 16GB class 10, 33 shots. Conclusion: As you can see this Sandisk Ultra card havs higher read speed. I belived my card reader is max out at 20MB/s. that's why it show 19.9MB/s read speed. However for a digital camera and camcorder, the write speed is more important than the read speed. Both tests clearly show that the Sandisk Ultra only meets class 10 rating but far behind the other two cards. The cheaper Transcend card can outperform this ultra card easily in write speed.