There are no differences in construction. They're all cheap. Across the board. That's why you can buy these devices so cheaply, because they are made cheaply. Take a look at some Buffalo Technology hardware. Proxim. Cisco. Then you start actually seeing a discernible difference in the quality of the components, the shell, software, materials etc.. To the OP, if you really want a quality piece of wireless hardware and dont' mind paying slightly more than the standard budget sector gear, take a look at buffalo tech's website. Very good hardware that bridges the gap from the low end equipment, Linksys/SMS/DLink/Netgear/Etc.., and the high end stuff, Cisco/Proxim/Wi-Lan and so on.