It's a cool looking building, I'll give it that. I really like the way it looks. Now that I understand how it works..........
It's like it gives every general 2 books in Fast Learner, which isn't bad, but for the cost of the buff, the 2 day cooldown period and the difficulty placing the building because of the amount of space it takes up, the 20% bonus is almost anticlimactic. Overall effect is kinda, meh.
If it also gave a 20% bonus to loot, or if the cooldown was shorter, or if the buff cost less, or if Mary got a 20% bonus to her built-in double XP skill instead of earning the exact same bonus as an unskilled general, or if the 20% bonus also generated star coins, maybe it would be more exciting.
I can see it being kinda useful in MCC since there's not any blockng going on and the XP is pretty high on that campaign. So maybe BB is thinking this is a useful extension to MCC.
I'm not unhappy with it, heck it was free, it's cool looking and it does do something. But there is also room for improvement.
Edit:
Just saw the increase from 20% to 50% with the newest changelog. I think it's going to be a lot better than the original version. Thanks BB!