Hi guys I had one of this. Mac os is one of my favorite os. this thing is amazing you should get one if these.it has high speed booting I think this is one I f the best in mac book air series I also likes its design. It run on a core i5 processor and 8gb ram so its fast.it has an internal storage of 128 gb .and its battery life is amazing.and also they gives you a warranty of 1 year apple is the 2nd leading os in the world they offers you a full privacy & security and as buyer I recommend buying this product