TX has yet to give a price. Units will be on sale "By the end of the week" according to their site. If unit price is below 16$, I cant beat them on price, but that zsun can do more than their dongle can. (It can host a local DNS filter, sit between the switch and the actual wifi network, because it has dual PHYs and can do bridging, can be used as a platform for various activities against the USB port, and of course, it can act like a USB stick adapter for the SDCard slot.)
I dont mind tinkering, and I doubt it would take me more than a few hours to get a functioning device AND a how-to put together. I have gotten quite comfortable with embedded linux (from hacking my NAS to serve as a small mini-server.)