That's a lot of bunk. If the thread works in your Bernina, it's fine. The reason I don't use Essential thread from CT is that it has a lot more lint than I like, and I like to minimize lint buildup in my machine. Aurifil 50wt is my new thread of choice for piecing and quilting because it is so smooth and lint-free. It is also a finer thread, so more fits on the bobbin. However, I am thinking of moving to polyester thread for piecing because it is completely lint-free.
As long as you are aware of the lint problem and clean your machine frequently (be sure to read up on good practices for cleaning; you don't want to blow into the machine or use canned air inappropriately), you will be fine with the Essential thread.
Edit: I have a wooden adaptor for the CT thread that I have, so it fits on the spool. Should also mention that I have a Bernina 1230 that is something around 15 years old and still going strong. My Bernina has handled any thread I've thrown at it over the years, but now I like to pamper her with lint-free as much as possible.
Last edited by Prism99; 08-10-2012 at 12:39 PM.