Yes, yes and yes. I took our program from nothing and made it ISBAO certified. We are actually gearing up for our 2nd audit (Stage 2) in March. I kind of giggle at your question of growing pains. Do you have time for me to write my book on it? In all seriousness, it takes a lot of work and needs commitment from the top down. If upper management is not sold on the idea, it will never work. If you don't have a positive safety culture in place, it will never work. If you don't have your every day processes documented and actually follow them, it will never work.
I can say without a doubt, SMS and IS-BAO certification absolutely made us a better and safer operation. If you're on the cusp of whether or not to adopt and implement SMS, I would strongly recommend you do so. If you have any more questions, feel free to ask.