There may be a superior alternative at some point.It's expensive, but I'm going to get one. I'd really prefer a clutch type setup. This one seems firmly entrenched, and our only choice.
The technology exists, it just remains to be seen if the manufacturer will make something that can bolt up.
Ford recently made a Fiesta RS concept car. It would be silly for them to add power without addressing traction.
I've got my fingers crossed but not for a Quaife.