I have this overlock very pleased now for a few months and am. It is already pre-threaded on delivery and I had not even been re-threading. But even if one times the thread should tear: the manual is very detailed and also on the machine itself notes are attached to thread. The knife cuts each material tested so far from nice and sharp and the stitches are very even. The seams look better than some factory seam. I would highly recommend this machine fully.