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Mine is working perfectly!

I've been using my MacBookAir 13 inch 1.3 Hz, 256 Gb, 4GbRAM with absolutly no issues. This is my first Mac, and I am extremely happy... I love it!! is fast, light, and the batery lasts for ever!!! :)
 
I got my 13" air last week and I haven't had any problems with wifi. I'm using the 2tb extreme to connect and I'm consistently getting 30mps.

Once I got as high as 61.27mps. Also had a 15" macbook pro (2010) and never had wifi issues but I did have a HDD die on me and something else I forget. So far I haven't had any issues though.
 
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