I haven't had one but I know a couple of people that have. They felt better after but I think it took a while. I think one had to have a couple iron infusions before she got up to where they wanted her levels.
I have maintained for one year at this point. I am steady at -120 pounds. =) 40 pounds lost pre-op
I've had a couple and they aren't bad, much better alternative to the stomach upset and constipation from the pills.....I would rather have the infusion anytime.