I have also recently purchased this. Very very fast.
One useful FYI: the speed of your compact flash cards will be the new bottleneck. If you're using something like 30MB/s or slower cards, its no faster than USB2 (did side-by-side... around 30MB/s compact flash cards are barely saturating the USB2 interface, so you see about the same transfer speed using FW800 because the card is the limiter, not the USB2). My 90MB/s cards screamed though... very much worth the upgrade.