I only gave 4 stars for battery life because I haven't needed to charge it yet. I've had it for pi think a couple months and it works nicely for weighing coins or any other small objects I decide to weigh out of curiousity, it has a number of divpfferent types of weight, but the only one I've used is grams. It comes with a weight for calibration and the calibration is super easy. The case feels durable, and I dropped it a couple times by accident (hand spawn due to nerve damage caused me to accidentally drop it a couple times and the case didn't get so much as a light scuff mark on it. It's similar to a low end hard case for a cellphone in how it feels, and behaves like the case I have on my cell phone so I suspect it will hold up well longterm. I've tossed it in my backpack, and taken it with me a few times and it didn't mess up the calibration at all so it's pretty sturdy and not overly temperamental in re to staying calibrated. Having the calibration weight that fits inside the case that the protects the scale makes it easy to not lose the weight. The bottom half of the case is part of the case that makes up the bottom of the scale so the bottom of the case and scale are basically one piece which I also like since it makes it less likely to misplace the case for example. I do recommend it in that it is consistent from coun to coun and is able to weigh really light object… a feather didn't register on it, but if your item is heavier than a feather you shouldn't have an issue with it working.