Since the film is opaque and sticks to the top of your material, it solves the problem of trying to see marked lines on dark or heavily patterned fabrics.
It adds a slight stiffness to your fabric, which can help keep your stitches even, especially on thinner materials.
While many love it, some reviewers on Needle 'n Thread note that stitching through the extra layer can be slightly tougher on hands with arthritis. Playing Around with Transfer-Eze - NeedlenThread.com Transfer Eze
Once your project is finished, the film dissolves entirely in cold water, leaving behind only your thread work. How to Use Transfer-Eze in 5 Easy Steps
Remove any sizing from your fabric by washing it first to ensure the adhesive sticks properly. Since the film is opaque and sticks to
Sew directly through the film and the fabric. Most users find it "needles" well without gumming up the needle.
You can photocopy or print designs directly onto the film, eliminating the need for light boxes or heat-transfer pencils. Playing Around with Transfer-Eze - NeedlenThread
Place a sheet of Transfer-Eze in your inkjet printer so the design prints on the "film" side. Pro Tip: Avoid "draft" settings to prevent paper jams.