Brett in Denver
The description on the Amazon page calls this a class 10 card with UHS-1 performance.  And while technically correct, (Full HD 1080p recording). You would expect more performance in the Sequential Write speeds.  It actually doesn't even hit the class 10 speed unless you round up (9.951 MB/s).  I have 2 of these cards and they both report the same speed.  My Kingston 8GB SDHC Class 4 writes at 11.854 MB/s.  Now keep in mind the Sandisk beats the other cards in the random reads and writes.  So maybe the design for those faster random reads and writes causes the sequential writes to run slower than expected.  Here is the test for the San Disk followed by the Kingston-----------------------------------------------------------------------CrystalDiskMark 3.0.2 (C) 2007-2013 hiyohiyoCrystal Dew World : [...]-----------------------------------------------------------------------Sandisk Ultra 16GB Class 10 Micro SDHC (UHS I Speed?)* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]Sequential Read :  20.651 MB/sSequential Write :  9.951 MB/sRandom Read 512KB :  20.191 MB/sRandom Write 512KB :  2.628 MB/sRandom Read 4KB (QD=1) :  3.656 MB/s [  892.5 IOPS]Random Write 4KB (QD=1) :  1.665 MB/s [  406.4 IOPS]Random Read 4KB (QD=32) :  3.293 MB/s [  803.9 IOPS]Random Write 4KB (QD=32) :  1.618 MB/s [  395.0 IOPS]Test : 1000 MB [F: 0.0% (0.0/14.8 GB)] (x1)Date : 2013/03/26 21:28:09OS : Windows 7 Home Premium Edition SP1 [6.1 Build 7601] (x64)=======================================================================-----------------------------------------------------------------------CrystalDiskMark 3.0.2 x64 (C) 2007-2013 hiyohiyoCrystal Dew World : [...]-----------------------------------------------------------------------Kingston 8GB SDHC Class 4* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]Sequential Read :  20.287 MB/sSequential Write :  11.854 MB/sRandom Read 512KB :  19.925 MB/sRandom Write 512KB :  1.728 MB/sRandom Read 4KB (QD=1) :  3.747 MB/s [  914.7 IOPS]Random Write 4KB (QD=1) :  0.017 MB/s [  4.2 IOPS]Random Read 4KB (QD=32) :  3.684 MB/s [  899.5 IOPS]Random Write 4KB (QD=32) :  0.017 MB/s [  4.3 IOPS]Test : 1000 MB [F: 53.3% (4047.8/7592.0 MB)] (x1)Date : 2013/03/27 10:48:56OS : Windows 7 Home Premium Edition SP1 [6.1 Build 7601] (x64)