We were given a hand me down battery operated swing. If I have another kiddo I would seriously consider buying a plug-in swing. DD used almost 100 bucks in batteries in our swing over 7 mos. that we used it. D batteries are expensive. She love love loved her swing and used it a lot for long naps.
Our swing would switch between side to side and front to back and dd really only cared for front to back. I'm sure some babies would have a different preference though.