The Wheelwriter is a really nice electronic typewriter, probably the best. But new spare parts are no longer available and if a circuit board goes down - thats it - end of typewriter ! Ther IBM Selectric III is a mechanical typewriter, so there is more scope for repair if it goes wrong. The III is less reliable than its predecessor the II, and the special 96-character heads aren't as common. Many come set up for a 'bicycle' shaped ribbon cartridge which is also getting hard to find. So are spare parts unless you live in the USA.