I saw the demo video at a pet store. Bought a medium one from Amazon.com for $28, local Petsmart sells for $49!! That's a lot of $$$ for a comb regardless how well it works. But it works.
The amount of hair it pulls out is so scary to the point that I am wondering if it is pulling out hair that won't be coming off naturally for a while. After reading this thread I feel more comfortable now.