I was on Geodon for quite a while. I used it for psychosis as well as my antimanic drug. I was on 160 mg. I was also on Lamictal (and still am), which is in the same class of drugs as Trileptal. Have you started taking the Trileptal yet? It sounds like you're still in the middle of some changes, so it may be too soon to tell how well you will respond to it.

The only reason I stopped taking the Geodon was because of sedation. I was working at the time and it was making it very difficult for me to get up in the mornings. If I split the dose and took half in the am, I'd be falling asleep at work. If it hadn't been for that, I would probably still be on it, so I'm fairly sure it's not uncommon for it to be used long-term.