I use the ClearBlue Monitor - picked it up in the US and have my sister send the sticks to me when I'm out. I think it's super easy to use and definitely tells you when you O - and when you are about to O. Also, I think the monitor stores your information so it builds a history which it uses to help interpret each month. I know this sounds a little far fetched, but I recall reading this and I think this is the advantage over the disposable sticks.