I purchased the 3piece 35x75 almost 2 years ago. It fits over my dining table (the dining room is my sewing room). I have been very happy with it. I got it with a 60% off Joanne’s coupon.
I have used Olfa for years and really didn’t notice a difference.
One thing I did do was cover the screws that connect the sections with blue painters tape. The always seemed to catch on things.