https://marco.org/2007/04/29/raid-0-in-a-macbook-pro-as-a-huge-laptop-fan-the
As a huge laptop fan, the one thing that frustrates me is that even with a high-end 7200 RPM hard drive, everyday laptop performance is abysmal compared to a desktop with a fast disk. And having used a RAID-0 desktop, I’ve seen first-hand that there are huge real-world performance gains. If a proper backup is maintained (and that’s a big “if”), there’s no reason not to.
Maybe I should get one of these… but to match my MacBook’s 100 GB 7200 RPM drive, they want almost $400! The bare drive is only $109 at Newegg. Ouch.