It's fun, but can be a lot of work. You will need to do A TON of research before you consider getting them. You can't have any dogs that will be able to get to them, and very careful around the turtles with kids. 3 toed Box turtles need an extremely varied diet, so you'll have to be willing to buy the things they can eat, know what they can't, and prepare a meal for them three times a week. You'll also need to know the symptoms of diseases. I don't know how many diseases your tortoise can get, but box turtles can get a lot, so you'll need to do a lot of research and buy a few books. Keeping up their pen (WHICH SHOULD BE OUTSIDE) is a lot of work, too. I'm always constatly changing the landscape so they don't get bored. If you have anymore questions just ask. In the mean time, here's a great site to look at.........
http://www.boxturtlesite.org/bxbook.html
You will need to look at many other websites, though, to get a full understanding, but this is a great site. Hope I helped.