I've been using SwitchMe on my tablet for my wife and I(it's free to set up two partitions, and cheap if you want more). It works pretty well and even lets you

I've been using SwitchMe on my tablet for my wife and I(it's free to set up two partitions, and cheap if you want more). It works pretty well and even lets you see how much space a user's account is taking up. The only real downside is that the tablet has to reboot to switch users which can take a few minutes depending on the device.