I have a big JuneTaylor which I like, but I never use the grid lines to actually measure something. I do use them to line things up, but measure with my rulers. I also have a small Olfa and really like it. I think when I buy another, I will buy the Olfa. I'd really like a huge table that I can set up to use and also a place to use the turntable mat. I think that would be great!