I have used it a few times but not everyday. I am still taking birth control but plan on stopping in the near future. Even though the instructions are in Japanese, this thermoeter is very easy to set up! I was pleasantly surprised. Since I have not yet used it to predict my cycle, I cannot comment on the accuracy, which is why I only gave it 3 stars. I will update this post once I start using it regularly.
The reviews were good so I paid the crazy amount despite it being only in Japanese. I was able to figure out how to set the alarm with little trouble and I like that I can look back at previous days. However, after only 1 month the buttons only work every 10th press or so, it's not saving temperatures, and my temperatures are all over the place being diligent to take them the exact same time everyday before I get out of bed. I am extremely disappointed in the product. I was hopeful with the number of good reviews but would not recommend the item.