I took it. I have PCOS too. I found it really helped to regulate my cycle (was 90+ days then dropped to about 30 - 40 days). I've conceived twice now just with Diabex. Having said that, clomid should regulate your cycles too since it makes you ovulate so could be pointless. It should be combined with a healthy diet anyway otherwise, there's no point taking it IYKWIM.

Side effects - for me, mild nausea when I got to taking 2.5 tabs a day. I dropped back to 2 tabs & it was fine. Reduced appetite & a little weight loss (about 2kg).

Good luck whatever you decide.

ETA: I was taking it for 9 months and 7 months before conceiving. DH also had a low sperm count.