When I use my LA to SID I always use a ruler. It takes longer to do for sure when using a ruler. When I first started LA, I would take the extra time to make sure I did my best to stay in the Ditch. I wouldn't charge extra for me taking longer, because I knew if I did well, I would have a return customer. I am better now and can go faster, but to me it's about doing it correct and making sure my customers are happy. If you aren't happy with your LA person, you might want to find someone else.