Be warned: not everybody gets this.

Myself, I've tried 5-6 different meds and have had nothing in the ways of the described. Might as well have been taking vitamins.

Just so you don't get too disappointed...

It's been 15+ years for me (although with lots of on and off), but if you're used to living with ADHD, it can feel like a fog is being lifted. You can suddenly hold more in your head at once and don't have to mentally "drop" a thought to be able to process other things. It's like slotting in an extra stick of RAM.

The meds probably have that effect on anyone, but it's profound if you've been working with a deficit.

Yes, the first days are incredibly clear. After the first week it becomes less noticeable for most. Not that it's gone, just less present .