Ken
I have lately purchased two micro-SD card one Sandisk Ultra 64GB microSDXC and 1 Sandisk Extreme Pro microSDHC 16GB. The first one claim 30MB/s the second claims 90-95MB/s. I 5 tests on my Galaxy Note 2 and 3 different benchmark test on my computer using USB 3.0 card reader. I can only get 7-8MB/s (this not even class 10, let alone UHS-1). I even did real world testing by copy a large set of data (2GB of photo).The result is no different. I do own Sandisk extreme SDHC card on my T3i and I do get 65MB/s of transfer rate. I strongly recommend consumers to test their premium (UHS-1) microSD. I felt very disappointed on Sandisk. I will try other brand like Samsung, Patriot or Lexar.