I did this a couple of weeks back. My experience is similar to his.
Afterwards your mind just feels really really good. I think the closest i could describe how it feels afterwards is like your mind took a really big and satisfying shiet. And now it feels clear. It stays that way for a week or two. Its like a million annoying voices whinging inside your head 24/7 finally shut the fuk up.
And for the first time you realise that those voices existed at all, because you had never heard the sound of themnot being there. You realise that noise that fills your head are not your thoughts. Its just the echo of the shietty outside world seeping inside your head making you believe the things it wants you think.
You are just left with a mind that is just yours. Eveyone else is back where they belong. Outside your head.