I am pretty sure I am going to get an M11x R3 to go with my M17x. I was wondering if it was really necassary upgrading from the i5-2467 to the i7-2637. Here in Aus its a $300 upgrade. I realize its a better processor but if people have no problems with the i5 then I probably wont bother with the i7 since I have my 17. If it makes a big difference then I will fork out for the extra. Any imput would be appreciated. Its either an M11x or an iPad for travelling. Also, any word on the M11x R4? Would it be worth waiting?