Prism99

I used Mettler silk-finish thread for years. Finally, I tried Aurifil 50wt 2-ply. I would never go back to Mettler. The Aurifil left *much* less lint in my machine and is just a much smoother thread. Aurifil 28/2 would be a much thicker (and I assume stronger) thread than the 50/2 I use now for both piecing and quilting, so honestly I would not worry about the thread not being strong enough.

My belief is that the thread breaking test (where you jerk the thread between your hands) is not a good predictor of how good the thread is for sewing. My favorite threads break easily when I do this. I think that test is reliable mostly for judging whether old thread has dry rot or not. In that case, a light tug would easily break the thread -- not the jerk that I gave the thread when I tested it (and which I suspect most people use when "testing" thread).

Edit: I would not use 28/2 Aurifil for piecing because of its thickness. Aurifil 50/2 works perfectly for piecing and makes my seam allowances more accurate.