The idea for RAID0 on a laptop is completely ridiculous, for that matter any duel hard drive configuration on a laptop is stupid. We have enough problems with laptops and battery life and heat. Alienware has completely lost my respect with this kind of thing. They are clearly just listing the few pros that can come from a RAID0 configuration. They are just in it to take peoples money. Taking it from a more technical angle, RAID0 is an over hyped technology for consumers, the majority of the desktop computer market. A simple link can let you know what I mean, a lot quicker.
http://hardforum.com/showthread.php?t=952998
As the link clearly states:
"RAID cannot provide a performance boost in all applications. This statement is especially true with typical desktop application users and gamers. Most desktop applications and games place performance emphasis on the buffer startegy and seek performance of the disk(s). Increasing raw sustained transfer rate shows little gains for desktop users and gamers, as most files that they access are typically very small anyway. Disk striping using RAID-0 increases linear transfer performance, not buffer and seek performance. As a result, disk striping using RAID-0 shows little to no performance gain in most desktop applications and games, although there are exceptions. For desktop users and gamers with high performance as a goal, it is better to buy a faster and more expensive single disk than it is to run two slower drives in RAID-0. Even running the latest and greatest drives in RAID-0 is unlikely to boost performance more than 10%, and performance may drop in some access patterns, particularly games."
People setup these RAID0 configurations, see a slight performance boost at most and proceed to brag about it.