They take a little time to prepare. I usually warm the oven to 200* and keep them warm until the entire batch has been made and we can all eat together.
The trick I have found, is to give a quick swipe of butter to the pan, pour in the batter, and be sure to let them cook long enough on one side to get slightly brown before turning them. Otherwise they will rip and not roll up like you want them to.
Nothing beats a nice Saturday morning Swedish Pancake breakfast!