I've been on Humira for nearly 3 months due to multiple fistulas, and mine are healing. My gastro examined me only 3 weeks after I started Humira, and even by then he discovered that the fistulas had begun to heal.
I did have bad side effects for the first couple of weeks (severe headaches, disorientation, exhaustion, feelings of being feverish and fluey) but they have almost completely gone by now. Everyone's different with side effects - some people have a lot, some only a few and some none at all.
I definitely recommend it because it's worked for me. But again, reactions to it are very individual and ultimately you won't know until you try it how it affects you.