We were unable to eat out on the deck and enjoy the late afternoon and evening due to the sun in our eyes.  from 5 p.m on it was purely unenjoyable.  We hung the roller shade on the west end of our pergola and we now block out the blinding late afternoon sun and truly are loving it out on the deck now.  bungees were a bit short as pergola is 8 ft. wide so I just cut lengths of braided cord and tie it to the posts at whatever length suits the situation.  I think the brackets would be too limiting and not used most of the time anyway.  Also love not having to worry about the shade out in the rain and damp weather and the mould and mildew problems.