Product seems good but can be slow on long cuts. In addition, it is quite difficult to go through the high ribs of the steel roof panel (you will have to bend the tool along the contours). It took me about 10 minutes to make a longitudinal cut on a 12 foot sheet of metal roofing. I understand that the time depends on the speed of the drill - I used the cordless drill at high speed (it still took about 8-10 minutes per pass). But the product works well and I do not regret the purchase. Makes a nice clean cut and goes through steel roofs with ease. If you need to make rounded cuts, then this tool is for you. If you have to make a lot of long cuts in steel roofing panels, metal snips or a grinding wheel will go much faster.