I tried Vyvanse for around a week a few weeks ago. The first couple days were nice, but it started making me oddly foggy and out of it. Plus, for some weird reason it took 2 or more hours to really kick in for me, which wasn't helpful for getting going in the mornings. Neither one of those is typical from what I've heard of others' experiences, though.
I switched to Dexedrine earlier this week and it seems to be better, weirdly (Vyvanse basically becomes Dexedrine when digested). I see a lot of the posts here are negative experiences, so I just wanna mention I have heard/read of lots of good experiences with Vyvanse, too, so I hope ya don't get discouraged.