Ovulation tests...yay or nay?

Hi all! If you can help at all with some advice it would be MUCH appreciated. I am thinking of going for ovulation tests for a try. I have never been regular on my cycle. Sometimes a few months, sometimes eight.  I have been trying to check myself and log it but am not feeling much change. Did anyone just find them frustrating or did they help when TTC? If you did use them, what brand did you use? I have heard positive and a lot of negative. Please share experiences with them! Thanks!