We have one that just goes front and back and my kids all enjoyed it. I don't know anyone that has one that goes sideways. I do know someone who had one of the FisherPrice small ones and they liked it because it was easy to move from room to room or even take with them places, but they weren't able to use it as long as we could ours.
This isn't a swing but we got one of
THESE with our last and he loved it. The great thing about it is that it can be folded when not in use and put up somewhere so it's not just out taking up space.
Oh, be stocked up on LOTS of batteries for whatever swing you get - they can really use a lot!