Summary: Very briefly, my apartment has metal studs in the walls. My laptop (Intel NIC) is two rooms from the router (D-Link) but the signal goes through the two walls at 90 degrees and I get 5 out of 5 on the meter. The problem had been my second desktop (D-Link NIC) is diagnally on the opposite side of the apartment and the signal goes through 4 walls at various extreme angles. I averaged 1 of 5 bars in that room. I installed this router and immediately got 4 out of 5 bars.
Summary: I've read the reviews on all the current wireless routers and decided to go with the 631 since newer versions really did not offer much more of an upgrade other than looks. It comes with software cd (ignor it) and load it manually. Use the 192.168.10.1 browser address to use the router wizard. I disabled the WISH feature in advanced settings (due to drops)and otherwise had a fast install.