One of the key benefits of the new Haswell processors is reduced power consumption and, therefore, longer battery life. Apple claims up to 9 hours for the 11-inch model and up to 12 hours on the 13-inch compared to 5 and 7 hours previously. We're still wrapping up our own battery tests, but our preliminary findings show much improved battery life over a single charge.
The new MacBook Air has a lot in common with its predecessor in terms of features and look and feel. While the improvements are mostly subtle, they succeed in making an already excellent product even more desirable. Under the hood improvements to the integrated graphics and flash storage help boost performance, while improvements found in the new Haswell processors help to improve battery life. Some may find the 128GB of the lower-priced system confining and I'd recommend the upgrade to 8GB of RAM for all users.
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