i've used alot of ridged cutters,both 1 and 2 bladed i do recommend them..as for replacement cutters they are easy to find. saws and such are nice but you need blades cords, etc. and that might be a prob,with falling off the ladder, but the ridged "clamps" on and you can stop and rest with out taking it off. and you only need the muscle to run it, good luck and be safe doing that job!