I bought a MacBook Air 13'' ultimate (i7, 256GB, 4GB). At Christmas, spilt water over it. House insurance covered it and it was sent to Apple to fix. They couldn't fix it, so sent me a new one. Have just received the new laptop, and it's an i5 rather than an i7. How much slower is the i5? I'm not sure I want to mess around with sending the laptop back and getting a new one sent out again! Silly Apple!