I currently take EPO from the cd1 to O date, and have been for about 3 cycles now. I haven't been successful with a pregnancy yet, but I have noticed an improvement in my cm. Before, I had very little cm. Now I have "noticible" cm so I know it is working.
If you do use it, be sure to stop taking it after your O date because if you do get pregnant, EPO shouldn't be taken during pregnancy.