Pros: I bought this so I could easily add some SATA drives to an aging Linux server (running Gentoo). Although it has driver source code support from Promise, a nice perk is that it is natively supported by the newer 2.6 kernels, which is the method I used. After a reboot, both of the WD 500 gig drives I hooked up to it were recognized and usable.

Cons: All I can think of is that it adds about 2 seconds to the boot time when it enumerates the drives attached to it.

Overall Review: It beats buying those PATA controller to SATA drive adapters for almost $20 each and allows you to add 4 more drives overall.