All of my friends who are using MBA mid-2012 have SSD failures.
The SSD failed after two weeks out of warranty.
In my case, the MBA mid-2012 was freezing immediately. After restarting, the screen turned white with blinking folder.
I have done all the solutions and they all didn't work. I went to the apple store right after that since I thought that the warranty would last until the end of August 2013 (I brought the product at the end of Aug 2012). The guy looked on the system and told me that It's expired since 1st of August which is not correct.
After asking my friends and local stores, I have found that a lot of people who brought MBA mid-2012 got the same issues. Most of failures happened after the warranty is expired. Although It's my fault that I didn't buy the apple care on time,I am still very disappointed. The apple products were more reliable than the others.
MacBook Air, Mac OS X (10.7.5), Mid-2012 model