it works and does it's purpose. the display is very dark, which testing early in the morning with the lights off is difficult. I also don't like the loud, high pitched, nonstop beeping once the temp is ready. I don't want to wake everyone up when I'm testing. the tip bends very easy, but partly my fault bc I forget to put it back in its case, but for the price it's a good little piece of my TTC journey. the premom app makes it very easy to log your temps as well, so that's a plus. no guessing and adding up temps to find a baseline.