The most recent testing was done by Jim Wilkes for Hot Boat Magazine, and published in the April 2000 issue. Dockside magazine also tested the Summit Design and found a 50 degree drop in drive operating temperature and published their findings in the August 1999 issue. They also did a side by side comparison between the Summit Design and the Halo Design and found the Halo to cool the drive by an additional 8 to 10 degrees. Testing was also performed by the United States Customs Service. They found a 50 degree Fahrenheit drop in temperature.
Gene Weeks of Team Lazar did a side by side comparison between an Imco Power Shower and a Summit Multiport Drive ShowerŪ, and found the Multiport system to cool the drive by an additional 15-20 degrees over the Power Shower.