Sewing plywood is sorta a stunt. I remember the first time I shot my recurve. The arrow sailed into an abandoned building I expected it to bounce off, but it passed right through a window hole covered in 3/4" plywood. A truly excellent archery target that will stop the most powerful arrow is made of a bag with some fabric in it. Fabric is tougher than one would think. Of course a lot of that is that the target absorbs the arrows energy, but trust me, if you sew frabic you come to respect what it will do to a needle.
Anyway, Techsew has a quality product. The devil is in the details. What makes a good machine is stuff you find out after you bought your first wrong one. That is the dilemma. Little details of feet, compositions of the package of included parts make a huge difference. If the machine is not specifically set up for the exact type of work you intend, then there is a chance they goofed something. The Techsew machine I bought was at one time sold for leather work, and a version of it still is. It is well made, but it marks the leather like crazy. So my problem is their having goofed this segment once, they now have a different machine like the Cobra 4, and my suspicion is that it is probably just fine. But I can't spend another 3 K finding out. If I was in the states, I would get a Cobra. But living in Canada, some risks are worth it.
I have been wondering whether any of these guys is related. Does anyone know whether one is the NA importer, and the rest are just reping machines in their local markets?