If you’re planning on using this device with alternative firmware, be aware that this model (wl-520gu) has known USB port issues. It’s unclear if the problem is hardware or software. Depending on what you want to do, you may or may not encounter problems; for example, printing and usb disk access seem to work for most folks, but I could not get my USB 3G/EVDO aircard working for an internet connection. I tried various versions of openwrt, dd-wrt, and koppel(USB 3G enabled firmware based on ASUS source), with similar results. Info about the USB issue(s) can be found via your favorite search engine.
If you’re planning on using the router for printing, be sure to make sure your printer is supported on the Asus site. It does raw pass-through printing – there is no queue (not cups based). Giving this 3 stars because it seems pretty decent as a wi-fi router otherwise.
ASUS WL 520GU Wireless | hauntedinkbottle