I recently purchased a Bernina sewing machine. When I went for lessons, the woman told me not to use the thread I had, I use Essential thread that I buy from Connecting Threads. She told me that the spool is too loose on the spindle. She also told me not to use a cone holder because that too is too loose. I have an awful lot of Essential thread and have been using it for years on my Brother sewing machine. She said that it may be okay for Brother but not for Bernina. This surprised me because she sells thread on cones but it is polyester, which I don't want. She also sells rayon thread by Mettlar. Should I stop using the Essential thread on the Bernina machine? What are your thoughts and experiences?