Did the forbidden fruit make us wise? The serpent said so. The gnostics said so. Many others say so. But what does Christians say? And how do they interpret the bible? 

In my Swedish translation it simply states that Eve gained wisdom, but then I read the Living Bible and there it seems that Eve just thought she would become wise:


  How lovely and fresh looking it was! And it would make her so wise!
They became "wise" in that they now knew (the difference of) Good and Evil. The tree is explicitly called Tree of Knowledge of Good and Evil, so we should assume it is right that eating the fruit conferred that knowledge. This is also confirmed by them having a different view on their nakedness after eating the fruit. 

So, yes, that fruit did confer knowledge of Good and Evil on them.