I unpacked the 4423, set it up and went right to work. The sewing is very precise, easy to thread, load the bobbin. I have other machines that are all computerized, this machine give you the sewer the ability of manually controlling all aspects of the machine. I have really enjoyed sitting and learning all the different stitches, needle positions, that this machine can do. I was looking for a non-computerized machine and this really has lived up to what it says it can do. I put 12 layers of heavy denim together and used a denim needle with yellow jean thread and it just breezed right through it no problem. I also used a VERY delicate fabric and the tenderness and ease and stitching was just as perfect as the heavy material. I really give this machine 5 stars because it is truly and fun and well built and accurate machine.