Pros:
- You become what is essentially an absolute GOD.
- It doesn’t matter if God or other gods existed before you got this knowledge; what matters is that you’re probably a god now and probably know more than they do.
- You know literally everything and can use that knowledge to either exploit or shape reality.
- You can transcend death, life, and beyond if your mind is strong enough.
Cons:
- No one might want to believe you. Not because they think you’re lying, but they just won’t accept how true it is.
- You might die or go insane and NOT be able to transcend it because your mind is too weak.
- Will the death be slow and agonizing? Depends on how deep your mind has failed you for being human.
What if you were given the choice of ignorance or knowledge? Would you like to know the secrets of the entire universe, but there’s a chance that either YOU can’t handle the truth or nobody would WANT to believe you because THEY can’t handle truth. The truth is both undeniable and possibly mind-breaking (for certain humans).
You have a choice to either live in ignorance or know how reality actually works. However, because reality and creation are infinitely bigger than you, YOU might not be able to handle it, but if YOU CAN handle it, nobody might WANT to believe you because they can’t handle the truth.
Once YOU or anyone else knows about the truth, it’s impossible to dismiss it as a lie. It’s so true and so real, it would change their lives as they know them (for better or for worse). Truth doesn’t need validation to stand—it just is. This Truth is what might ruin people, including you.
If your human mind is too weak, it might have no choice but to go insane. So you need a strong mind to handle this.
This is a question if the human mind really deserves to know what reality actually is instead of what they think it is.
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I don’t believe omniscience is possible. For a start it would make one an automaton, as one would relinquish even the perception of any autonomy, since one would know the future exactly as it must occur.
So no, if I were wasting time wishing for superpowers then omniscience would not be one of them, omnipotence perhaps, and immortality, if one were omnipotent then one could at least end their existence if it became too painful.
This reminds of a joke on live TV, when Jimmie Carr asked the late great Sean Lock, what would you do if you had 3 wishes Sean? Sean said mm, how many of the band One Direction are left now Jimmie? Jimmie laughed and said 4 I think, and Sean said, nah no point then.

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Me neither, that’s why I put this in a fun post because it’s a hypothetical situation
I don’t know that there are things we don’t know that we can’t handle or not, but it reminds me that someone or other once said that when humans achieved self-awareness it was almost more than they could handle. And still is.
Our dogs are elderly but they aren’t aware of much but the present moment and the progression and endpoint of their aches and pains doesn’t perturb them.
By contrast I know the story arc of my life and have always known where it’s going to end. Why do people tell themselves comforting lies about the afterlife, if not because they understand the fact of their own mortality and can’t handle it?
I have come to believe that the enduring appeal of theism, for all its terrible problems, actually papers all that over so that people don’t have to face it and come to terms with it. Instead, they engage in what the late, great Ernst Becker called “immortality projects”. And religion is the ultimate immortality project, pathetic though it may be.
The irony in all this is that when you accept that you are mortal and that you live in what I call a “mortal scope”, you actually come to find dissolution to be a great comfort. Instead of “I came, I saw, I conquered” it becomes “I came, I saw, I let it all go”. Or in my particular case, “I came, I saw, I said ‘meh’”, lol.
So even the prosaic fact that none of us gets out of this alive drives people to all sorts of madness – so I doubt very much that we could handle knowing everything about everything but on the other hand, on this end of things I’ve come to feel that this mortality thing that I once thought highly consequential is really just nothing more than the way things are, so no big deal [shrug]. This allows me to get on with the business of taking pleasure in the things I enjoy and care about without trying to make it last forever. YMMV.
The OP is hypothetical and we’re already running into contradictions, another of the pesky snags of omniscience.
Reality already does a good enough job of making me into a lazy bastard who doesn’t feel the need to be interested in people or what they accept as true. 
I’m a practical person, and the idea of knowing everything is just unthinkable to me. I’m aware that I won’t know everything and am always on the lookout for indications of such. I make adjustments accordingly.
So when I came across the OP’s post, my first reaction was that I am still alive and still sane, so I must know enough to make that happen! Would I like to have more knowledge? Of course!! But there apparently isn’t so much knowledge that it would cause insanity or death. So I reject the hypothesis.
Rejecting hypotheses should be familiar territory for any atheist.
Hi! I fall under the category of insanity in a good way not a bad one.
Hence my hypothetical answer, and you also implied a postulate in your hypothetical. Which i tried to address.