the thing is if it's normal to get lh surges a few times before o the machine should know this and tell us when we get a surge again. it only ever tells me the first time, so we bd a few times and then have a break for a few days which is probably when o really happens. i've been using it 4 months and feel like i have wasted that time as it told me the wrong time to bd
i honestly would say it's not worth the money if it i can't even tell you the 'correct' time to bd.(after the surge you keep poas for a few more days and it never told me i had another surge)