I have a MBA 11" 2012 with the original 64 GB SSD that I bought about 2 years ago. I should have known better that that was not sufficient. I went and bought the OWC SSD Aurora 240 GB to swap out the 64 GB. I installed it and it recognizes it but when I try to reinstall the OS X it took like 18 hours, but then took very long to boot and I never let it complete because it seemed to hang. I contacted OWC and they told me the "Command R" and reinstall is done by Apple and didn't have anything to do with the SSD. I reformatted the drive and tried again but said the same thing. So instead I went to my Time Machine via USB and restored which worked, I had to shut down the machine because it hung in the "restart" process but after it booted fairly quick. To make a long story short. SOME applications work as expected but then on others it does a lot of beach balling especially when I do anything with the system preferences. It is just not performing like the original. Is this normal for a 3rd party or is the a clear cut bad SSD or am I expecting too much? I paid $219 so it wasn't cheap.