Hi Claire Bear
My hand crank is 104 years old – still going strong. As Bettie says, its great for al fresco/tent sewing (mine is in my Summer House now) and simple to use for complete beginners or children
Mine was the one I first learned to sew on
I dont think I would bother with an overlocker. The double seems we do are so strong, and quick and easy, I dont think it would be worth your while
Ive never bought one, and to be honest, both of my Berninas have overlocking stitches anyway