Mamaroo vs Rockaroo

I registered for a Rockaroo because I liked the idea of the back and forth motion like a traditional swing. For my shower, someone sprung for the Mamaroo instead of the Rockaroo. I've heard good and bad things about the Mamaroo. It certainly has a lot of bells and whistles, but I think I would miss the back and forth. I can't decide if I should give it a try or go ahead and swap it out for the Rockaroo. Anyone have any experience with either of these?