I was lucky enough to start with Aurifil when I first took up quilting (3 or 4 years ago). It was the thread my LQS shop sold, so it's what I bought. I've only tried one other for piecing and immediately went back to Aurifil.
This past week I tried it (still 50 wt.) for FM quilting instead of my usual Isacord poly. Oh my - absolutely love it for that, too! Just the right sheen, perfect tensions with my Janome 7700, not a single thread break in a 60 x 84 quilt.
Michelle