Different usage from an Airport Express I think.
The existing usb adaptors that BearExtender sell are designed for pulling in long range Wifi signals - think wardriving. The antenna is replaceable so you attach a huge high gain one and pull in signals from 'a hundred metres' or more in ideal conditions. (Although they also make PC compatible models, people using Windows tend to choose other brands like Alfa). Since this new model is mains-powered then I assume it more for borrowing/stealing wifi from neighbours across the street or boosting the signal from a nearby public hotspot.
I remember my first year of uni several years back, just after I had gotten my first laptop (MacBook Air). The campus was built next to a big river on a hill and I liked to sit outside on a bench right at the top of it and appreciate the beautiful view, the tranquility, and (at least at the time it felt like it) brisk wifi. I was playing around with the settings and I had noticed there was an unsecured network with a router's default SSID (something like [Netbox]-294126) which, to my surprise, actually had a strong enough signal to connect and browse the web. I knew that the closest flat was about a mile away with lots of stuff in the way. Then I realized that I had managed to connect to a house across the river, which was at least 200m across. I realized I could also log into their router...which was password protected... google's default password for [Netbox] routers...it works.
TL;DR: Connected to unsecured router across a river and added a password and changed the SSID to something that informed them that they should probably change it.