I took Esther's course in April 2010 and purchased a StretchSit cushion there. After about 90 days of use, two of the nubs had come off, and I received another cushion in its place. I have been very careful not to rub against the cushion when adjusting it to my back (placing it just below my shoulder blades) but now 3 of the nubs on the left side of the cushion have come off.
Has anyone else experienced this problem? I saved the nubs and foam rubber that was behind the nubs; could they be somehow reattached?