That's a really tough one for me. There are memories that it would be bliss to be rid of once and for all. On the other hand, some the people I met and things I learned as a result changed the way I saw the world - made me more socially aware, and more empathetic.
So if I could, would I want the peace and innocence back at the expense of social/political awareness and the desire to help other people? I think I'm glad the tech doesn't exist so I don't have to make that choice.