The benefits are that you don't have parasitic loss to the mechanical fan because the electric fans only run when needed. I used the 05+ Silverado fans, they fit pretty well and I only had to cut the tabs off the side and it slid in. I had to adjust the lower radiator hose as well. Then I made some brackets to mount the fan to that use the holes for mounting the upper radiator shroud. I couldn't find an affordable fan harness that I liked, so I end up making my own.