Bob Purcell of Superior Threads spoke at our LQS several times in the last 4 years. He is the one who convinced me to try Bottom Line and So Fine not only in the bobbin but as a TOP thread for piecing. I have used those two threads almost exclusively for the past 4 years. I teach the Learn to Quilt series at my LQS and get the newbies started on them because it helps them to sew that scant 1/4" seam allowance. No bulky thread! As far as the idea that it melts with an iron or cuts through other thread has not been my experience. I also love how long my bobbins last before running out of thread. Give it a try!