Who's using kegg and what are your thoughts?

Im 7 months ttc, have 28-30 day cycles, and I'm currently 27. Been looking into getting kegg and a lot of my friends and even sister in law told me about it. My SIL said she had been trying for 3 years and that kegg was actually the reason she got her pos, but I want to know about more experiences before I fully commit! It definitely is more affordable for me it seems, and I love that it also has a kegel exercise feature (this is something I care a lot about). Thoughts? TIA