I bought the Wireless HD Net Connect when it was last on Tech.Woot. I like it. It was perhaps a bit much, but it is very convenient.
The Wireless HD Net Connect really is nothing more than a wireless HDMI bridge. It won't connect your TV to the internet, it won't give you free Netflix, it doesn't strictly need a USB port except to power the transmitter. It doesn't need drivers or hardware beyond what you would need to run an HDMI cable from your computer(or game console!) to your TV. It does basically what an ordinary HDMI cable does, it just does it without wires at a range of 27 feet.(It does also come with a 3-foot HDMI cable to connect the receiver to the TV, in case you needed an extra.)
The transmitter is a bit wide. On my laptop, it blocks the USB port next to my HDMI port, which means that it actually consumes two USB ports: one that's blocked, and one to power the transmitter. The receiver automatically goes into "sleep" mode after a few minutes once you disconnect the transmitter, and it will wake itself up again when you plug it back in again. If you don't have a monitor connected to the receiver, your laptop will not detect a monitor connected, it really is just a wireless bridge.(Think with portals.)
The transmitter gets very hot during normal use. This is normal, and not really anything to worry about, but maybe keep flamable things away from it.
Though the connection is fantastic for watching video, it should be noted that if you're going to try playing games, there is a very slight, but perceptible, lag induced by the wireless transmission, so if you're playing reflex-based games, you're going to get thrown off.
Bought a second one today.