Summary: It's the most sensible calculator out there-size (perfect anywhere), use-ability, price, design and durability. Battery seems to be replaceable but at this price range, it makes sense to by a new, clean one after years of use. I hope this model is never discontinued nor redesigned.
Summary: It takes awhile to get used to pressing the keys so that they work. If you forget to turn off the calculator, it turns off automatically after 8 minutes. If you would like to replace the battery when it no longer works find the small screw with the battery cover and replace it with an LR1130 battery. I wasn't sure whether to give this calculator 3 stars or 4 stars so I played it safe and gave it 3 stars.
Summary: I just wanted a little calculator for my purse. No bells or whistles. Just to do comparison shopping and figure quantities of home dec and craft supplies without messing with the calculator option on my phone (not a Smart Phone). Sure the shipping was $5, but that was my estimate for one bought locally. A great deal.