bretto,
Get your google going. There's plenty on this site, and even more on Grumpys, about this topic. Done to death, really.
In summary: 1. If you can find cheap kits, you save some money, 2. it's a quick way of making an all malt (extract) beer and 3. if fermented properly it makes a reasonable beer. But you will probably never make something you are truly proud of like that.