I bought the Guidelines rulers (2 of them with the attachment) and don't like them. They stick up about 1/3" and are wobbly. Don't waste your money on them. After I bought them, they wrote me an email asking me how I liked them. Apparently they needed to know my advice for some reason and I told them what I thought about them. I stuck them away and will never use them. I like the Omnigrid the best. But I have sooooo many rulers for so many things and they are all very helpful and I can't live without all of them.