the RPM is supposed to just gradually change, that's how it works. The concept is like a Reeves drive, reducing engine rpm variation. Some versions (Nissan?) have fake shift point feel programmed in, which I found really odd. CVT makes some sense with a naturally aspirated engine where the rpm can be kept nearer tom high efficiency, but I don't think they make sense with a turbo where you basically want two operating regions.
I think DSG is better technology, and much as it pains me to say it perhaps better than conventional manual, but it is offered on only a few cars.