I used Mettler silk finish cotton thread for years. Finally tried a spool of Aurifil 50wt 2-ply and *LOVE* it! It is smoother, finer (so more fits on the bobbin), and creates very little lint compared to Mettler. Although a spool of Aurifil is expensive, it seems to me there is a lot more thread on the spool. Even if there weren't, I'd still buy Aurifil over Mettler.