JUST make sure you get one that is google-licensed if you get an android based one. Some lower end ones are android 4.0 based but not licensed, thus no google play/youtube/etc., and they won't let you download the google play app.
We have a 10" Samsung Tab 2, their 7" should be the same just smaller size. We bought our 4yo a kids-based on (Nabi) for Christmas, and the bane of it is no google play - have to rely on Amazon app store (and knock-off apps to play youtube vids). Good enough for him, but painful to quickly set up like our others, and youtube was the favorite app of our 4yo!