I found that with Vyvanse I had to ask my immediate family for feedback on any differences they saw. They could see things way before I thought I could feel any difference! Vyvanse is so gradual throughout the day than the shorter acting stimulants.
What made me realize that it really was helping me was when my doc was on vacation and I ended up running out of it for a few days! Then boy howdy, was I ever able to tell the difference! It was NOT good.
Also, it was of VERY minimal help at 20 and 30mgs. I am now at 50mg and have recently approached my doc about going to 60 to see how I do. My counselor said he thought it would be worth it to see how well it works at that level.
I have been working with my clinic with Vyvanse for close to a year now.