A friend took them and it had a bad effect on him, made him really depressed so be careful. He seemed to find them really effective, didn't want to smoke after just a few days.
I was going to try them but decided against after hearing how they may have effected him and am going to try patches again as quit for 4 months on them before.
Think a lot of it is psychological and your really wanting to stop mentally, I think that is what makes the difference.
How long have you been on them?