We take between 1000 and 3000 images per shoot, so a fast, reliable card reader is an absolute must. In the past, we've used Lexar products that have all been USB-based; when we saw this product, we sprang on it banking on the speed increase moving from USB to firewire. The unit is small and very light - it almost feels like it was "thrown together" instead of compact. When it works, it's VERY quick (as you'd expect); however, it's difficult to get the thing to operate. The front of the unit has a large metal flap to cover the slot for the memory card. The slot is very large - almost twice as large as what would be required for a single card. There seems to be some sort of magnetic guide for inserting the memory card into the unit, but it's strangely difficult to get the card into the reader. Not only do you have to "hunt" for the right slot, but you have to force the card into the reader to get the unit to engage (and start drawing power over the firewire connection). I understand that you need to seat a card firmly, but wouldn't it be easier to do that if you could SEE where the card was going instead of worrying about what might happen if you accidentally bend the pins inside the card? Great speed, but poor engineering has forced us to toss this gear out.