I bought an Alienware many years ago and have absolutely no complaints.
In fact, after owning it for several years, the motherboard crapped out. (turns out that the board had a bad chipset run, and I surprised them because mine lasted considerably longer than most of them...) I called support completely expecting to have them want a lot of money because it was out of warranty, but I had the surprise of my life.
The mobo's they now carried weren't compatible with most of my components. They ended up replacing everything but the HD and optical drives, and even installed a newer version of Windows. (Win 98) I didn't pay a single penny, (not even shipping) and got basically a brand new machine that was even faster than my old one.