It's a known product. He speaks the truth, however not every system plays nice with the UAD card. IRQ's and all that. But the concept is true- you use a seperate CPU on the card to handle the effects you have in that format. Kind of like the Creative and EMU cards have onboard effects that run from the card instead of the main system.. The effects are nice sounding from what I've heard.
Remember though that you tying up a slot and some resources to run that card also, so the tradeoff isn't totally free to the system.
Googling should give some other opinions and reviews.