I had stitch issues when I bought mine, brand new,
and the dealer kept telling me I needed to adjust my bobbin tension a hair,
even sent it to their repair person twice.
After weeks of some real headaches, not being able to do the lessons in the free Usage class,
I took the thing to a town a couple counties over, where people I knew had gotten rave service,
and the guy not only made time to look at it right there on the spot, but did some adjusting and set it right. The bobbin tension was several ROUNDS off!
Because it had come to me in poor adjustment, he did not charge me.
He showed me how it ought to behave right, even sewed through 4 folded layers of fabric-batting-fabric at one time - It performed like a buttered angel.
And now it is the treasure it was meant to be.
I advise it heartily.
If you want to spend lots for the accessories and attachments.