Summary: I purchased one of these, along with a LINKSYS router. It was easy to set up in the PC, but a bit of a fiddle to get going. Reception was all over the place. I had to move the router and PC about in the different rooms to get a decent signal. But now it is working, it works well.
Summary: First I bought a PCI card because I thought it would be really fast - straight onto the PC bus. Nice theory, but the Linksys card only ever reached 18Mbs maximum, usually down around 11Mbs, and lots of dropped connections. So I bought a Sweex USB adapter and a USB 2.0 extension cable. The cable let me position the adapter for maximum signal strength and voila - 54Mbs, rock solid, no dropped connections. Cheaper, better, faster!
Summary: Not sure what exactly the problem was, but this card refused to work with my PC. I tried it with my neighbour's and it worked fine. Tried other PCI cards with my PC - they also worked fine. It seems this card and my PC just didn't like eachother. No problems getting a refund from Amazon though, and judging from the other reviews this card works pretty well when it does work - so it's worth a shot.
Excerpt: Me compre esta tarjeta PCI para solucionar los problemas que ofrecen los adaptadores USB en sistemas operativos distintos de Linux. Elegí Linksys porque es una marca que solamente se dedica a dispositivos de red, por lo que se supone que saben hacerlo bien. La instalación me resulto muy sencilla. Abrir el ordenador e introducir la tarjeta en la correspondiente ranura PCI de mi placa base. Arranco el ordenador.