i've had it for a couple of weeks now, and i will say, it works well.
calibration isn't in the instructions, but, if you hit and hold all 4 buttons when you turn it on, after it says hello, it will enter cal mode. pressing unit advances to the next screen, which is the auto shut off time. if you turn off the power, or use all 4 buttons to reset it, it does not seem to save, so you will have to purchase calibration weights in order to change it. after setting the auto shutoff, it then lists the 3000 g, which is the max weight. it seems you can change it, but i haven't tried. the next shows random numbers, seemingly the raw value of the scale sensor, then it goes through asking for a 500g calibration weight, and after that, a 2000g calibration weight. the 1000g weight doesn't seem to be necessary.
after calibration, the scale seems to do pretty well with the calibration weights. weighing in the center and in the corners seem to be repeatable, although it may be a little off at the very edges or corners.
the mat that goes on top of the scale has a hangover on the left side, which helps keep it in place, but it can slide up and down.
using the scale to measure liquid, it seems to refresh quick enough to easily allow you to gauge when to stop, although, it may depend on how quickly you pour.
one thing to note, the precision mentioned in the description. this scale is accurate to 0.1g from 0-500g, 0.5g from 501-1000g, and 1g from 1001-3000g. this isn't over the weight range of the scale exactly, but rather over the displayed weight. meaning, if you decided to weigh pour over or something, in something heavy (or a collection of things), if you tare out the weight (zero it out to measure the difference), it will still display the first 500g up to 0.1g accuracy. that makes the 3000g limit of the scale much more useful.
lastly, this is a rebranded scale...many make the same scale under a different brand. i can't remember which combination of buttons it was, but if you held 2 buttons at the same time, it would bring up a muted speaker (no sound) icon, even though this scale doesn't have sound to begin with.
i'm very happy with this scale. the price was good, and realizing that the 0.1g accuracy works up to 500g after taring is great. i used it to measure the water and ice in my 64 oz yeti, to figure out how much water i was actually drinking (got very close to the limit of 3000g).
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