The Ideal seam guide is great. You do get the exact seam measurement you want. The scant 1/4 was always hard for me to get, but with this guide I get it just right. When the sticky side gets dirty all you have to do is use some Fantastic, Mr. Clean or any mild cleaning soap, spray on then use your finger to clean it, run water over it and pat dry and it is as good as new. I have used it for over a year now and it still sticks fine to my machine.