No opinion, but I was surprised that no one I played in singles or team used one.
All of my teammates experienced the same during our trip to Vegas.
I wasn't at the BCA but I am sure that if I was there and allowed to use it I would without question. I have never played BCA but have been to the VNEA at least a dozen times and must say that I have never gotten more bad racks, either intentional or accidental, at any tournament and the magic rack would be a godsend to me.