I used it with OPKs for 10 months. It measured when my estrogen went up but never registered at a peak reading after the first month. I had to test in the am and then use OPKs in the afternoon. I thought it would be more helpful to be honest. I got pregnant after 2 months of starting acupuncture.
So far, I'm not having a good experience with the monitor. I've been using it for 5 months now and only had a peak reading once. I know that for the first one or two, the monitor has to get to know your body, but by now, it should be working correctly. This month, I've had nothing but high bars (2 bars) and it never peaked. It's either the monitor or something is wrong with me.