After the initial cost of buying the unit, you have to buy the sticks for £20 for 20 each month which isn't too bad I don't think, as I was going to use the smiley ones which aren't much cheaper each month, plus the monitor gives you 6 fertile days and not just 2. Well, I say this, but it's not worked for me. Not this month anyway. It's day 19 now and still no peak. Used a cheap OPK and only had one line so I don't think it's even high as the monitor says, it should be low. God knows what's going on?!?
I bought it as I don't want to mess about trying it interpret lines on sticks or take temperatures, I thought it would be easy and tell me when to do it ....
I'll keep using it though and hopefully next month it will have gotten "to know me" and it will work!! It would be nice!!