Here is a nice review comparing the two.
http://www.anandtech.com/show/4554/apples-11inch-macbook-air-core-i7-18ghz-review-update
I for one, went for the i7 considering it was only 90 more dollars. As for the fan and heat issues, I haven't experienced any so far.
It is really a dilemma for me. I am always torn between i5 or i7. Some people say i7 is too warm and not much faster and some people say they dont have a problem with the heat from i7. still thinking now.
It is really a dilemma for me. I am always torn between i5 or i7. Some people say i7 is too warm and not much faster and some people say they dont have a problem with the heat from i7. still thinking now.