I have many question about ES6 classes.

What's the benefit of using class syntax? I read that public/private/static will be part of ES7, is that a reason?

Moreover, is class a different kind of OOP or it still JavaScript's prototypical inheritance? Can I modify it using .prototype ? Or is it just the same object but two different ways to declare it.

Are there speed benefits? Maybe it's easier to maintain/understand if you have a big application like big app?