I had weight gain with the others too and some other interesting, unwanted side effects. I had fewer side effects with the Welbutrin XL and though if I go up on higher dosages at times it can lead to hypomania and never let it get further; we just know to cut back then and it is fine. I am a rapid cycler though that leans to depression at all times so having at least a low level (150 mg) of it is mandatory. It can be so hard to find that balance. I wish you well in finding what works best for you.