I have used Internet cheapy OPKs and got my surge quite clearly on them. I tested everyday around 4-6pm and got definite positives, from CD 10 I tested three times a day the first month I used them just to be sure to catch the surge as it's more common to see it in the afternoon rather than the morning. Have you thought about a clearblue fertility monitor? Takes the stress of analysing lines away. I have a brand new one for sale for £40, just posted about it. Temping was never for me, I wanted to know when I was about to ovulate and not after the event but each to their own xx