Initially, this appears to be an interesting device: four port hub, a networked printer port, wireless access and firewall/router. It could theoretically substitute for my three separate Linksys devices. I've been using the Siemens/Efficient Networks SpeedStream 2623 for approximately a year with an Intel Anypoint wireless card. The results are somewhat mixed:
Prior to the most recent flash BIOS update, wireless connections the router would frequently and randomly lock up. This was not a factor of distance, and resetting the computer/wireless card would not always fix the problem. I have not had these problems since the most recent flash.
My experience with technical support isn't very positive, but seems relatively typical of the industry. They clearly go by a checklist and endeavor to trying to find point blame it on some other component of the network. Ultimately I was able to find an obscure technical note on their web site that described the same problem.
I could never get the printing functionality to work from Windows 2000. (9x wasn't a problem, however.) I stopped trying when I realized my particular printer model (HP970) has both serial and USB connectors which I connect into each machine.
Range varies -- usually I can work on the front or back porch, or anywhere within the house EXCEPT the kitchen -- a running microwave will kill the connection. Speed definitely drops off with distances or obstacles. With medium/40-bit encryption enabled, 25' and three walls away, I get about 140kbps.
Although I'm happy now, it shouldn't take nine months to work the bugs out of the system. I don't have comparables to ascertain how much wireless networking is overhyped, but feel this sort of box should be relatively easy for a moderately technical user to set up.