Wanting to connect a Wii and DSi to the internet, I bought this adaptor because the product description states that it is "ideal for Nintendo" . The reality is that it is far from "ideal". Upon receipt, my first thought was that the wrong package had been sent because the product description on the box bears no relation to that on the invoice (Modern Tech are simply the retailer). Furthermore, there is not a single reference to Nintendo anywhere in the package, its quick installation guide or even within the more detailed pdf manual. The installation guide is exclusively about connection to a router and that would seem to be the product's intended purpose.
As such, you are totally on your own in setting up this adaptor for Nintendo consoles. Being reasonably tech savvy and having some experience of networks (albeit not wireless) I took this on board. After much browsing of the Nintendo and TP-Link (manufacturer) support sites and FAQs etc. together with the manuals I was no better off in learning how to set up the wireless network. By chance, I found some instructions for a different device at an independent internet forum and discovered that I needed to set up an "access point". Given that is not the default mode of the adaptor, it would have been very helpful if a slip of paper was included in the package to say simply "for Nintendo etc., first set up an access point". Another useful piece of advice would be that the PC must be online when you first set up the access point or the WAN will not be available. Even then, there is some configuring of settings to carry out and largely by trial and error.
It took the best part of a week to make a working connection to the Wii and that was as much by chance as through skill. Even then, a reboot of Windows Vista changes the network to "public" and loses the connection. This means that the whole process of setting up the access point must be repeated every time the PC is switched on. I have not been able to get the adaptor working with DSi at all because the DSi will not accept the adaptor's IP address(es) when entered manually and cannot retrieve these automatically. In this situation the retailer can only refer to the manufacter and I am still waiting for a reply from TP-Link support.
The product may suit those with wireless experience who wish to connect a PC to a wireless router or some other device but as far as NIntendo devices are concerned, the best that can be said about this adaptor is that the retailer will offer a refund. My advice would be to buy Nintendo's own adaptor which may cost a little more but automatically senses Nintendo devices and makes the connection for you. In the UK this is available from Nintendo Customer Services as a spare part for about Ł10. They provide a link to download the software. It automatically installed itself (Vista), sensed both Wii and DSi, then made the necessary WiFi connections. It then works perfectly.