Opk's what's your experience with them?

I hear women with pcos can't go by opk's. For those of you that have tried them. Ones such as clearblue advanced digital.. what was your experience?

I tested with a clearblue opk when glow said I was ovulating and I kept getting empty circles. After I finished them. I waited 4 days. And tried clearblue advanced. 2 days of empty circles and then 4 days of flashing smiley and then today a non flashing smiley. I also noticed my temp is going back up.

So, I'm curious. What are your experiences with opk's?