Summary: Obviously, this is more bulky than just taking along a USB cable to plug directly from your camera into your Firewire 400/800 port. But especially when using large capacity CF cards, you will appreciate the added velocity of the transfers.
Pros: This is a Firewire ONLY card reader that can work with either 800 or 400 connections. All cables are included. The transfer is very fast, visibly faster than USB. I use this with a MacBook Pro and I'm very pleased.
Cons: Compact Flash Cards Only. You really have to push them in solidly to make the connection, but a blue L-E-D lights when that connection is made.