I like the digital forms, too. Especially Quilter's World, which allows saving to your hard drive in pdf format.
The Fons & Porter and Easy Quilts don't allow you to do that - at least not that I can find. I even tried printing to PDFFusion as a file, but couldn't find a way to make that work. When your subscription term is up, you can't access the issues that you bought - so what you're buying is actually a year of access, but not the issues, themselves.