My experiences with gridded fusible interfacing have not been great. The interfacing can add a lot of bulk to your piece. If you are making a wall hanging, that's not a problem. However, if you are making a bed quilt, you may feel differently. I recently made a wall hanging with 2" squares that I paper pieced but think strip piecing, with lots of checking to ensure accuracy, would be the way I'd do it in the future. Good luck with your project!