Summary: I used USB 3.0 bus through Kingston USB 3.0 reader so the numbers are the max you should expect.. plus/minus some depending on the file size used.
Pros: *SDXC = Greater size than 32GB max SDHC siblings.
Cons: Dissapointed at write speeds--expected them to be at 30 MB/s but it is only stable at 12 to 13 MB/s... not bad but expected 30s because the packaging touted up to 30 MB/s speeds but apparently it was for reading files not writing.. it being "Ultra" it should have performed better, in my opinion. Read speeds are great at 42 MB/s, ahm, with a caveat.. see real numbers below.
Pros: Well its a memory card. Came with the little case that they all come in, got it from somewhere else for sixty. Works in my nikon d3100 well.
Cons: I couldn't find the write speed anywhere online so I thought that I'd review it here since this is where I come for reviews. On my laptop ATTO says 24/MBs read and 12-14/MBs WRITE. Not a con for a class 10 but SanDisk says its UHS-1. To me I was thinking like a class 10 plus type of deal but it's a regular class 10. Not exactly a con but I was hoping.