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I had problems with a cisco aironet, and it was inconvenient to take a large computer on site, so I only had a laptop. I sent for this product so I could telnet into the device using the serial port and it worked great on both the laptop running XP, and the PC running Vista. I heard complaints about Vista, but I just installed the driver, and plugged it in, and I was good to go.
What's great about it: it allows me to use serial ports on my laptop
What's not so great: needs more cable length, and its a bit pricey