Try to find out the service history and also if is there a local dealer close by who can service it. Ask if the technician is certified to fix it A certified technician is better than just a person who can fix sewing machines. These machine are a little more complex and a bit fussy. Also, how heavy is the machine and can you carry it to the shop or will they come to your house? Ask what the cost is for service and house calls. I purchased a used Sweet 16, I was able to call the company with the serial number and they told me a lot of good information. The prior owner had it about 5 years and apparently never used it much, it was a steal.