I've been on Yaz for about two years now and I like it; I've never had any problems with side effects, aside from when I initiallly switched from Ortho to Yaz because the change in pills sort of messed up my system.
Four of my friends were also on Yaz and liked it, but their doctors have taken them off of it recently (like in the span of the past 6 months) because apparently their Drs no longer trust that it's safe (one of my friends even said her Dr mentioned a possible recall?).
I saw my Dr. last week and she said its a-ok. I trust my Dr. and I really don't want to change pills, but I'm sort of confused about why other doctors might not trust it. My attempts to do my own research have made things even more confusing.