I bought a Sapphire 870 in October. So far so good. I have been too busy at work to really do anything fancy on it yet. I thought that it didn't like Thread art brand thread but then I found out (read the fine print) that with the walking foot on I have to lower the pressure foot pressure. I did and wah-lah! perfect stitches. Spent a few hours pulling my hair out as well as a lot of stitches over that one. I think I made a good buy though.