Once I discovered spray basting, the pins went away forever! I've never had any problems with wrinkling on the back. I don't spray heavily so it's pretty easy to adjust. It does require smoothing the fabric and flipping the quilt several times but it's a good investment of time. Once I'm finished, I easily quilt up to a queen quilt on my DM. I can even fold it up and put it away if I need to and it's just fine. I will never pin again.