Well first of all, I haven't been on sprintec, however I can tell you what I know based on the pills in general.
Overall, most women have a happy experience on pills. However, every pills affects each woman differently. As far as acne, some women have reported acne worsening, some have reported it getting better, some have said there was no change. I'm personally in the no change camp. Other side effects you might experience are bloating, weight gain, spotting, moodiness, etc. (things related to pms), however, this usually goes away fairly quickly.
As for the smoking- does your prescribing doc know about that? Smoking while taking estrogen based contraception increases your risk of blood clots and stroke. Though it's still not likely, the risk is there, and something you should be aware of.
Since each woman has slightly different biochemistry, it's just a matter of finding the pill that works best for you.