CVT is in principle technically superior to fixed ratio gearboxes but since it seems very different to drivers it has come under a lot of critiscism from motoring journalists who don't understand the technology.it had a continuous variable transmission which I thought I would dislike.
It is difficult to engineer inexpensively though. My favourite, in terms of clever use of technology, it Toyota's e-CVT which is a very light and efficient system but only applicable to a hybrid.