I heard of several people using them for tomatoes. Maybe on the Farming forum?
I was thinking of using one laid on its side to support tomatoes (50" tall cages). Like bending one into 32" squares so that 16 feet of panel supported 8' = 96" of row. Hopefully 32" would be wide enough to be self-supporting, otherwise I'd also need stakes. This drawing shows two bent panels supporting 16 feet of row.
But I would have trouble getting one home tied to the top of my car!