Calculator works great, use it almost every day so far.  Very light, has a single cr2032 battery and a solar panel and works well.  Only small issue i have is the keys in the far right in silver  gun metal look are hard to see in indirect lighting.  It looks sexy (the buttons on right that are silver) but doesn't function all that well if your classroom or office has diffused lighting.  Still usable just find myself having to angle it every so often to see what I need.