I'm currently on Yaz and really like it. It's my first BCP ever, so the first month's been interesting to say the least (getting used to it). No major side effects except low energy for a while and breast growth/tenderness. Nothing has happened in terms of weight gain/loss, but I feel like I have less of an appetite, but I'm not sure if it's the medication or what. I take my pills at 11AM, and I haven't been sick or anything (even if I haven't had breakfast/cup of coffee yet!)
Good luck!