I've been on Wellbutrin XL for about 1.5 yrs now and it works great for me. I actually started on it before I was dx'ed adhd- had thought it was depression/anxiety until after my son was dx'ed and started to connect the dots. I had tried several antidepressants but didn't see a lot of results until the wellbutrin.
I didn't have any problem with side effects with the Wellbutrin- it has a relatively low rate of side effects (according to my doc), but the thing they make a big deal about is that it increases your risk of seizures if they run in your family, or if you're bulimic. I don't know anything about grouchiness when starting it- I know that within a few weeks I felt great and it wasn't until a lot of what was going on in my head was gone that I realize it wasn't normal.
My doc had actually put me on strattera along with the wellbutrin (after the adhd dx), at a low dose because they interact, but it didn't do anything but cause side effects. I stopped that and started Adderall XR on days when I had school and needed to focus more. I've since increased the Wellbutrin from 150mg to 300 mg and now it works so well that I don't need to take the adderall very often at all.
Brand- name Wellbutrin was very expensive, but I've been getting the generic since I increased the dose.
I have a 38 yr old who takes wellbutrin. He has moderate adhd. It really sems to help him.