Alienware TactX - Roundup
My main problem with the Alienware TactX keyboard is that you're not really getting much bang for your buck. It just seems like a lot of money to pay for some lights. The macros and unlimited profiles are nice, but that's actually a fairly standard feature for a gaming keyboard. Just look at this past review of the top ten gaming keyboards. It's slightly dated, but a good guide.
In general, it seems like the Logitech G series and the Microsoft Sidewinder series offer the same macro functions and a few other nice features (I'm particularly fond of the LCD screens in the Logitech G series). They're also a fair bit cheaper (except for the newest Logitech G19 which about $170, but it features a color LCD screen). Most of these are available for the same price or less.
I'm not even sure about the unique look of the Alienware keyboard, since the the Saitek Cyborg seems to be a bit cooler. Of course that's all a matter of personal taste.
It will basically just boil down to what you're looking for in your gaming keyboard. If you like Alienware computers, then you will probably want to pick up a matching keyboard. If you like their style of background lighting and like the look, then it's a decent buy. I really feel like there are better deals on the market though, so consider the offerings from Logitech and Microsoft before you really commit to this Alienware keyboard.
Image Credit - Product Page - http://www.dell.com/content/products/superview.aspx?c=us&l=en&pageoverride=gallery_view1&s=corp&xdb=Z2xvYmFsOnByb2R1Y3RzOmFsaWVud2FyZS1hY2Nlc3NvcmllczpmbGFzaDprZXlib2FyZC1hbGllbndhcmUtdGFjdHgjcmVnaW9u