Learning from vis is a bad deal. There's a reason why it doesn't start until art scores get to ~20. And magi of an old age will devour tractatus written on their favored Arts.
See this chart to see how bad a deal it is. If it's all you have, then it's all you have, but it shouldn't be a first choice. It's incredibly risky.
It's possible no one else will bring an item and will make up in books. I'm just seeing a potential character conflict point. Sure, it's a great item it does a lot of stuff, but it's like Jack's magic beans. I think the items are great, my character may not. And then it's possible that no one ever uses it. Let's not forget warping. If we're in a room that's constantly heated by magic...there's warping happening there. If we have to question our grogs with the device always present, they may begin to figure it out. It might become a problem.