I had only pin basted for years... and always had issues with tucks on the back. It seemed if I used more pins the tucks just got smaller.. but still had issues with tucks. Once I discovered spray... no looking back as I had no tucks. My only issue is the cost. Pins can be reused , but spray is a constant expense. I like 505 but have had very good luck with the Dritz sold at Jo'ann. I do use a few pins at the perimeter just to prevent lifting when I am moving the quilt around.