I bought this in September 2011 to use on my Macbook Air. It has been working fine for the last 5 months until recently. The connection light is still on, but I'm having intermittent connection problems (ping from other computers stops intermittently and sometimes the system can't get a DHCP address). I've since bought another adapter to replace this one and I'm back in business. It's cheap, but don't expect it to last very long.
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