The advantages of intravenous EDTA chelation therapy have been well established. (Read Position Paper: American College for Advancement in Medicine). Even in the U.S. the FDA has allowed EDTA chelation for the last 50 years - although its use has been restricted to the removal of toxic metals (i.e. lead, cadmium, uranium, etc.)
Given the role of EDTA as an accepted treatment for the removal of unwanted toxic metals from the body, any dispute that "EDTA doesn't work" is reduced to nonsense. The extended role of EDTA as a tool to remove arterial plaque, prevent bypass surgery, or perform functions that affect conventional medicine "in the breadbasket," is where controversy arises.