I have just purchased a mercury accelsior PCI SSD from OWC. I have read on this forum that it improves boot times and makes the OS snappier when I use that card as my boot volume. But I have also read often that the boot volume and the one with my working projects (film editing) should be separate or performance will drop. So my question is whether I should leave my OS on the HDD and just use the PCI SSD only for my projects or if I should also put the OS on the fast SSD. Any advice or experiences are welcome!