Depends on what you like to do...If it is going to be judged in a show, better use traditional binding.

Otherwise, do as you like. Using a folded over backing can be quite attractive, and offers a chance to use decorative stitching.

If you are making quilts for kids in a hospital or quilts that will be washed a lot, the people using them request that the binding be machine stitched twice around, for durability.

It's practical.

That's the way my mother taught me, and that is the method I always use for charity quilts. It takes less fabric than when a separate binding is used, and it's faster.

If you want to do it that way it is perfectly acceptable. I tried it and didn't like the look so I do mine by hand to the back.

I solved the miter problem by buying the Quick Easy Mitred Binding Tool. I paid $15.95 and it has been worth every penny. I make and donate quilts to a children's charity and this is the only method I use. These are not heirloom quilts so the binding will probably last as long as the rest of the quilt.