I plugged it in to PCs with Linux and Windows 7 and it works perfectly without any set-up or installation. On Linux it uses the rt2800usb module which is built-in to the mainline kernel. There is no need to use the provided installation CD.
Reception seems good, decent speed and signal strength and it detects networks I haven't seen before. My wi-fi router is at a diametrically opposite position in the house from where I am using the TurboTenna. Previously with my old wi-fi card YouTube videos would start buffering and drop in to low-resolution mode all the time, but I don't have that problem any more. Positioning seems to matter, it works best for me near the window.
This product is essentially a USB Wi-Fi dongle attached with velcro to a high-gain antenna. Theoretically you could disconnect the provided dongle and connect a different one to the antenna. It comes with a long USB extension cable so you have a lot of flexibility in where you can position it. The only minus point is the little tripod it comes with takes a bit of persuasion to stay upright but it looks like you can plug in any standard camera tripod in the screw mount.