I bought the 2011 MBA 11in, 4/128GB, i5 on Wednesday. I'm now very seriously considering exchanging it for the 256GB i7 version, still in the 11 inch size as this is just perfect for me to take to uni. I've read through many, many threads here regarding excessive heat / fan noise issues with the i7, but it seems that some of those with issues were ultimately happy with their i7. So, I'd really appreciate anyone with the i7 (particularly the 11 inch model, since much of what I have seen seems to be in regard to the 13 inch model - but any input would be great) giving their thoughts on the i7 now. I'm also wondering what, if any, effect the i7 may have on battery life. The last thing I want to do is to exchange the i5 for the i7 only to be unhappy with the i7. Any thoughts / comments / suggestions would be really helpful and very much appreciated.