That's not what I think of when I hear "rotator." Isn't that called a juicer? But the site does say "rotator..." *shrug* Idk. I would like to try one of those in any case.
Correct, this is known as a juicer, but since it's meant to be used with a turning motion rather than thrusting or rocking, "rotator" is also technically correct.
As for whether or not it feels good, that's up to the user. I've never tried it, so I can't put in my two cents on the matter. It looks like of twenty-three reviews, only one was below four stars, so it seems that it has at least a few fans.