I use the polyester embroidery thread to machine quilt with, too. (The rayon is prone to melt in the dryer, fade in the washer, become brittle, etc.)
Some people don't like poly thread for quilting, so you might want to keep that in mind.
For my own quilts, I figure that fifty years from now, if the seams and quilting lines are the last things left of any quilt that I make and all that's left of the rest of it are shreds and faded fibers, it won't make any the tiniest difference to anyone on earth. I pray to God that I won't care about it, either. ;)