For a stationary setup at home or the office, this is a solid option that in theory can provide a really fast and reliable connection. In practice, you have to look at your computer and router capabilities, as well as check driver compatibility to make sure you get the performance you paid for.
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Pro It can provide very fast connection
Given that your computer has a USB 3.0 port and your broadband allows for fast connection, this adapter will not limit your internet speed at all. The maximum data transfer theoretically is 640 Mbps, which is way beyond the connection speed most people have. It's also dual-band, which may help alleviate Wi-Fi congestion as long as your computer supports a 5 GHz network.
Pro The internet connection it provides is very stable
Two large antennas make this adapter very good at receiving Wi-Fi behind walls, doors, and between floors. This is especially true when it comes to the long-wave 2.4 GHz signal that the majority of devices support. Generally, you don't have to worry about your connection suddenly breaking up.
Con It's very inconvenient to carry around
The adapter itself is quite bulky, it weighs a little over 0.5 lbs. It also has two long antennae sticking out, so it takes quite a lot of space in the bag.
Con It may not work on the latest OS's
The adapter may not work right out of the box on newer operating systems: Windows 8 and 10, as well the latest macOS versions because of driver issues.