GRI’s Mag-Drive MDII (17651-078) Outperforms Leading Competition In side-by-side efficiency tests, GRI’s Mag-Drive MDII outperforms the Laing 720B and the El-SID 2W2 by as much as 200%. Not only does GRI outperform the ......GRI’s Mag-Drive MDII (17651-078) Outperforms Leading Competition In side-by-side efficiency tests, GRI’s Mag-Drive MDII outperforms the Laing 720B and the El-SID 2W2 by as much as 200%. Not only does GRI outperform the competition, but also uses less energy. Using less energy in an environmentally concerned world is vital to staying ahead of the competition.