I'm looking at maybe buying a tool specifically for cutting the raised rib metal siding for my barn addition. I'll also use it for metal roofing and more siding later on. I've looked at the Malco turbo shear and considered a nibbler (electric) as well, partly because I've read that the turbo shear will scratch the siding. I'm wondering what any of you have had experience with, good or bad, and why. I've considered buying a metal cutting circular saw blade as well and this seemed like an option until I realized how much that might scratch the siding and the fact that it's a straight cut tool and that's it. I can always cut from the back side of the panel to avoid scratches on the exterior side. Nibblers and shears seem much more versatile. Cost is a concern as always. The turbo shear is just over 100 clams, which is fine with me. A brand mane nibbler looks to be 2x or 3x that much so, I'm having trouble with that. Ante' up you're experiences and suggestions. I'm all ears.