Do I know about them? Well, yeah! All I can say is they're really cool and you're going to want one. But if you want a computer for just normal use, I'd go for something cheeper. These are spec'd for gaming for the most part.
They are very expensive, almost to the point where it's better to just build your own PC. But since only a certain number of people know how to make their own, this is a pre-built gaming computer. They are the absoulute best gaming computers. They are rigged up to run anything that has ever come out for PC gamewise, basically. Just look on the back of your PC games. At least half of them say "Runs best on Alienware."