Pooky, I did some research and overall it sounds good. Sounds like doctors are as happy with it's results as Gluc. I read about some people finally ovulating and getting pregnant while on it, and one article said not to take 'while' pregnant, so that was sort of confusing... I got this info on it...you'll be glad to read that nausea and diarrhea are not on the list of side effects!
"Pioglitazone hydrochloride (Actos) — The most commonly reported side effects include upper respiratory tract infection, headache, sinus infection, muscle soreness, tooth disorder, and sore throat. It may cause mild to moderate swelling (edema) and decrease in blood count (anemia) in some patients. The prescribing information indicates that the effect of Actos on oral contraceptives has not been studied, but because of its relation to Rezulin it is recommended that patients not wishing to become pregnant exercise additional caution regarding contraception. Like Avandia, Actos is generally considered safer than Rezulin as far as liver toxicity is concerned, but it is also newer on the market and not used by as many people. Liver testing is recommended ever two months the first year of use, and quarterly thereafter."
I got this from
http://www.inciid.org/faq/pcos4.html
Hope it helps!