PlayStation Vita Slim
Sure why not. I bought mine refurbished over a year ago. It looks and works like it was new. Some games can be tricky to find but there are so many to download plus many more games out there for next to nothing if you dig a little.
I bought a refurbished one over a year ago. No regrets. Looks brand new and works perfectly.
Get a DS, or a 3DS. Its cheaper, and better built to withstand the punishment of a 4 year old. The games library is deeper and more kid friendly.
There is a game slot, it has a door/flap covering it. Or you can download games from the PlayStation store.
Its defiantly worth, it can connect with the ps3 and ps4, you can play all ps3 and ps4 game when you pair it with the vita. You can buy some select ps1 and ps2 game for it though.
I believe within 30 days you can return and/or exchange it. I've had mine for a few months now. Other than getting a version that was scratched up on the back and a faulty charging cable, it's been great. The Vita is awesome!
Yes this is the newest version of the PS Vita and you'll be able to use the Remote Play feature with your PS4.