according to andy the chlorella will pick up mercury, but the bond is not strong enough to escort it all out of the body so you are basically just redistributing it around your body.
there are many, many success stories on the cutler yahoo forum. i have researched chelation protocols deeply. the only protocol that people consistently report success with is the cutler protocol. pretty much every other protocol you have some people who have success with it, and many others who have either no success or actually get way way worse.
the cutler method is very scientific, very methodical. many other chelation protocols just take the attitue of 'lets just throw every chelator at this thing whether its proven effective or not' and that can wind up doing serious damage.