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Background of my set-up: I have an HP computer with a cable modem internet connection with Comcast. I purchased a Dell computer for an office downstairs. I bought the DI-624 router and purchased the DWL-120 to connect the HP computer to the internet connection as the Dell is connected to the DI-624 router by an ethernet cable.
My conclusion: The router works great. I would highly recommend it. The DWL-120? My wife uses the HP for just occasional surfing and light internet use. It works great for that. If you are a heavy-duty internet user you will experience occasional delays as the signal constantly fades from good to poor. I believe another review stated the same. It may not bother you. All in all it's a great device with super easy set-up. I just can't say to the frequent, impatient internet user that you'll be totally happy with it. I have not tried any other wireless products so I cannot compare my impression with others.
Bottomline: This product was super easy to set-up and it's getting the job done and best of all, my wife doesn't complain.

Initially I purchased the D-Link DWL-G120 because it has an exceptionally nice design. Sleek, compact, slick. Afterall, I thought, all these 802.11 wireless adapters are pretty much the same internally, right? Wrong.

I spent over three hours trying to get the DWL-G120 to work on my Dell 4600C system with Windows XP Professional. Despite the fact that the adapter was reporting a wireless signal in the 30-40% strength range, and the 95-100% quality range, I still couldn't get a stable internet connection with it. Pinging Yahoo.com always resulted in 50-100% packet loss.

My other equipment with built-in 802.11g works just fine on my network, so I knew something was wrong with the D-Link product. To test my theory, I purchased the NetGear WG121 for roughly the same price as the D-Link box, and my Dell was on the web in less than 30 minutes. I rest my case. Caveat emptor.

I bought the G120 and a DI-620 rev C router to connect a new machine running XP. I had to reinstall the driver more than once after XP could not find the G120 USB hardware. I downloaded and installed a newer driver version (1.12) from the D-link site to correct "connectivity problems" acknowledged by D-link. I am not sure if everything is fixed yet, but it works. The reported signal surges to excellent then can drop to poor. The ExtremeG protocol uses multichannels, with a forced use of channel 6, to get the high bandwidth. I suspect cross talk from somewhere in the neighborhood is impacting reported performance, independent of hardware. The main bandwidth limit is the cable connection anyway. The router sofware control is powerful. The security features alone redeem any hiccups with the G120.