
Let's get one thing straight first: I'm no cable expert. I just got this cable because it would enable me to set the Screen Resolution to 480p instead of the 480i. I do know that the Wii isn't a high definition gaming system and 480p may be a better picture, it isn't really considered HD.
Some people may have some doubt about this cable since it's made by a third party instead of Nintendo but this cable pretty much rocks. The cable is 9 feet long and white while the Nintendo Cable is shorter and gray. I like the white because it fits more with my Wii. So basically you jsut plug these into your HD TV, which you need to display HD picture, and start up the Wii. You probably wont notice a difference yet because you have to set it to HDTV/EDTV 480p by going into Wii Settings> Screen> Screen Resolution. And you've got yourself some pretty high quality pictures even though its not quite High Definition.
Something I've noticed with the cable is that it makes the pictures and colors look a lot sharper. Which is good and bad in some ways. In Wii Sports, this cable made the surrounding areas look perfect and the colors were richer and better looking overall. But with my Mii, his edges looked jagged and I could see pixels sticking out. The reason for this is, that without the HD Cable, the Mii still has pixels sticking out around the edges but it appears clear to the human eye because the colors aren't well separated and sharp to the pixels blur to make it seem like the Mii's head is round. With the HD Cable however, it sharpens all the edges and the increases color depth so you see the pixels and jaggedness.
In the Wii menus and Channels all the text and channel pictures appear crystal clear and perfect. I found out that the Nyko Cables only make Wii Sports look not so appealing. In The Legend of Zelda: Twilight Princess and Resident Evil 4, the graphics are greatly improved with this cable.
I've heard that the the picture is the same with the Nyko and Nintendo cables so theres no real difference in picture although there is a difference in price. The Nyko Cables are $20 and the Nintendo Cables are about $30. Not to mention, the Nyko Cables are longer to give you more room between your TV and your Wii. Unless you want everything Nintendo because you don't trust third parties, I suggest you buy the Wii HD Link Component Cable by Nyko.