I purchased this machine while working on a quilt. It was quilt as you go and in some places there were 15 layers of fabric to sew. This machine passed with flying colors. I used almost every feature. Yes the feed dogs appear they are not coming back up after free motion quilting but they do. The tension is controlled by sliding the thread between two metal plates on the far right before bringing it down to the front of machine. I replaced the needle a few times but it wasn't the machines fault. The semi auto threader works great. I own another brother but felt it was cheaper to purchase this one than have it serviced. Even the quilt shop owners can't find a reliable dealer to service their machines. I was already familiar with an auto threader and understood what the machine was trying to do. This version is better than the complete auto. I have been sewing/quilting for 36 years. This machine is willing if you are.