Sometimes I'll think I have a really great attachment and that the hairline is completely invisible. Then I pass a mirror in the hallway on my way out the door and it looks awful. The reason it looks so different? The lighting conditions. That can really fool you. So what really helps is a magnifying mirror. You can get them at WalMart or Target along with lots of other places such as beauty supply shopes and drug stores. They usually come in 5X or 10X magnifcation. They are an immense help in making sure that you've got the best possible attachment. I have a wall mounted unit but if you can't do that type then there are standup counter top models. Some have lights buildt in. But they are a great item to have on hand to make sure that you've got an undetectable attachment. Here's an example of a wall mounted magnifying mirror that is retractable.[attachment=0][attachment=0]Magnifying mirror.jpg