I have no first hand experience with risperidone. My psychiatrist first recommended that I go onto quetiapine but warned me against the side effects of sedation and weight gain. I hear that risperidone has a similar side effect profile. We eventually settled on aripiprazole, and I highly recommend this drug. Since, being on it, I've been hypomania free, I sleep fantastically and feel fresh as a daisy in the mornings. No major increase in appetite.
I was on risperidone for seven years for schizophrenia at first I was on high dose and put on lot of weight and was very sedated eventually decreased it but I still suffered from paranoia so I switched to amisulpride which has helped.