I've taken a month and have been using it during the evenings, and it seems to be working very well.
I'm using it with my BT Infinity connection, where I usually get around 8.2-8.4MB/s download speeds, and when I mix in my (very expensive, but work pays for) Three 4G connection, by plugging my iPhone in via USB and using it's hotspot, my speed is sometimes over double that. I can get a fairly stable 12-14MB/s and it peaks at 19MB/s.
I'm curious if anyone else has had better/worse experiences with them?
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