I have a Babylock One of the few Babylock on sale in the UK seems to be sergers, I have had it for at least 20 years but they still sell the same model, they are not difficult to thread, it just has to be done in a certain order. I put numbers under each spool and as long as you go in sequence its no problem. I would make sure you buy one with a differential feed as it makes a difference sewing stretch fabrics, and one that cuts as it sews is a must, happy sewing.