I've used Aurifil machine piecing when I want an absolutely flat seam and want to be sewing with cotton. It's a great thread, I'm just not sure this is it. Maybe I'm spelling it wrong? who knows.
If this is the thread I use, that is a fabulous price.
I just ordered 24 small cones of aurifil, so not in the market.
Lord knows why - it was a great price - because I use Bottom Line for almost everything.