All I can say is, buy one if you want one. I bought one, and I enjoy it very much.
It may be overpriced, but the overall look and feel of sitting at the desk with that purple glow and all the slide shutters and such... uhg, it's awesome. It's also not just labeled as a "gaming" computer... it actually IS a gaming computer, despite what people will say. Alienware has their own liquid cooling system separate from other brands, which may be good or... bad? It hasn't even come near to wearing out yet.