I just received and installed the StorEGDE from PNY and, of course wanted to test its speed. Before that let me comment on the product fit and finish. I have a 13"MBA 2013 - just recently got it from the Apple refurb store - love it so far. The StorEDGE fits beautifully in the SD slop with about 1/8" protruding - allowing for easy removal. When I first installed it it showed up as a hard drive on the desktop - formatted ExFat. I copied a large (5gig) file to it and watched the write speed in Activity Monitor. Write speeds were in the range of 60 to 121 MB/Sec. Read speeds were about the same. I then tested it with free Blackmagic App and the results seem about the same - see screen shots below. For comparison I tested the SSD in my MBA also. Obviously it was MUCH faster - see screen shot below. Overall I am very pleased with the fit, finish and performance of the StorEDGE.