Pros: I use this with 2 Seagate Momentus XT drives in my early 2008 Mac Pro. Works great.

Cons: Was a real pain to install into a Mac Pro. The reset button that you need to push in order to set the enclosure into RAID 0 is in a the back of the drive enclosure, where you plug it into the machine. It is impossible to do this without SATA extension cords. I am fortunate enough to have several PC's sitting around. I had to do the initial set up on a workbench with an open PC, before adding the enclosure to my Mac Pro. After that process it worked like a charm.

Overall Review: If they make a revision to this product, and really want Mac Pro users to take advantage, they need to rethink the way you have to initialize the drive. There is no way anyone can push the reset button while the drive is plugged into your Mac Pro. It is physically impossible. Include extension cables, or move the reset button to a place that can be reached while the drive is installed.