My Tree KHR 123, has stopped it's drifting now also. At first it would drift 2 or 3 milligrams overnight and I would need to rezero between uses but has not drifted off zero in a week now. That larger platter and AC power with optionalk shutoff make it easier to use than the smaller Smart Weigh.
One thing is for certain though, I would never pay more than a couple of hundred for a scale after using these inexpensive ones. I made some check weights by snipping off lengths of solder and wrote down the weights and neither the Smartweigh or the Tree have never been off by more than .002 grams when checked and that is good enough for me