A awful lot of jigsaw problems is, in my (not so humble.. 50 years of experience) opinion, is user error and expectations. When I use my 40 year old Skilsaw, I'm shoving thru thru hard because I know that it will cut anything from steel to concrete. What I don't expect is for it to give me a cut that will be within 1-2mm for start to finish. I also have a 30 some year old Bosch that I have cut aluminum, glass, wood, and steel. I have the two Carvex', corded and cordless and both cut to my expectations. I use my tools to make parts for commercial refrigeration part replacements and they work great for me. I have made thousands of $s worth of parts in the last ten years and I have no complaints regarding anything I've fabricated in that time frame.