I switched to buproprion (450mg/day) a couple of years ago without a problem.
I have no doubt that others will comment that they found the generic to be less effective.
My recommendation would be to follow the advice of your doctor. If she/he said to try it, then do it and don't pay any attention what others my tell you of their experiences.
We are all different and we have no way to know if what happens to someone else has any relationship to what will happen to us.
Best of luck to you.....Mike