I've been on it for about two years. It has helped me control my anxiety fairly well, but I can't really speak to weight effects. I have gained weight over the last couple of years, but I also started working from home and have had several major stressors during that span of time. Plus, I'm staring down the age of 50 so my metabolism is also slowing. I didn't notice any side effects from it at all, though, and it has been very well tolerated by my system.
I hope that helped, and good luck spinning the Wheel of Drugs!