I have an MB4. She's runnimg in another room right now. Love it. She has some quirks including I have to lubricate her and clean the bobbin area which is not difficult but she's 3 now and has only been back for service once. I set up embroideries with 4 colors loaded and next 4 ready, get the baby monitor so I know when she stops and do chores or sew with small Janome while she works. She's not picky about thread and bobbins can be changed without removing the hoop. Only complaint is commercial needles don't have flat shank so they have to be carefully changed to make sure the eye points the right way but with 4 they don't dull up as quickly.