Summary: The manual is overly cautious and confusing. However, on the second attempt to set up this AP, I just plugged in the AT&T Sierra Wireless USB modem, took "default" settings, and it simply worked perfectly. It has been up and running for about 3 hours, and surfing from two computers at the same time is as good or better than any WiFi hotspot I have used. The firewall and router configuration for this AP provides some complex and professional quality features.
Summary: This router works as described, but I found it a bit confusing to follow the suggested security set-up method described in its instructions. In fact had to ignore the suggested security set-up and do it in the initial set-up rather than later as suggested. I think there may have been something lost in the translation of instructions into English. However, that was the only glitch in the set-up. I am a bit disappointed in the range. It will not reach all rooms of home.
Summary: After a lengthy phone call to tech support, it was suggested that I return the "diffective product". My 3G usb card was on their list of approved internet cards, but it would not work. I have sense found a wireless router for less that $100 that worked right away. At least Wal-Mart's return pollicy was excellant. (DON'T FORGET YOUR RECEIPT!