I was on YAZ for 3 months in late 2006. I was crying ALL THE TIME. Literally, if I dropped something on the floor --I would cry. Now I lean towards being an emotional person and even my mother, who knows me, loves me and understands me finally said one day "WHAT is WRONG WITH YOU? THIS is NOT YOU." I switched to Microgestin 1.5 Fe and it went away.
I do know the copay from my insurance was significantly higher for Yaz.
I did not gain weight on YAZ, however, I have experienced a 5lb increase on Microgestin-- but then I did eat my fair share of cream cheese cookies this winter, so the jury is still out on that one.