Apparently the Coast Guard has reached a different opinion on this particular technology. Whether it is better than alternatives or worth the money is probably a separate question, but the assertion that there is no objective evidence of efficacy is an opinion not supported by the data.
http://www.de-bug.co.nz/Clippings%20...st%20Guard.pdf
"De-Bug TM units have been used successfully in a wide range of sizes and in various applications. De-Bug TM users include: military forces of several nations; marine interests; other transportation sectors; police and fire services; and commercial/industrial sector clients. The largest unit in use to date is a Model L-50,000 (with a design flow rate of 13,225 gallons per hour) installed, with ABS approval, on the 267 meter M/V Cossack Pioneer."
Apparently a lot of dupes out there...