Has anyone else tried or know someone who has tried the clear blues easy ovulation monitor?

I am currently ttc and I bought the CBE ovulation monitor...it was WAY expensive but worth it...if it works? Has anyone had any POSITIVE experiences with it? Or know someone who has? Mind you I do NOT want negative stories bc I am trying to remain positive and hopeful...unless of course, you're gong to tell me I could be negatively affected by using it.