The Screen on my kit had a burned-out Display. Does not turn on all of the time. The top line of the two-line display appears burned in whenever the unit receives power.
The calculator arrived very fast, was easy to assemble, but seems that it has some bug in the controller - the first digit/letter disappears in some of the calculation modes. Fr example I type "888 / 8" and at the moment I hit "=" the first digit disappears and on display is shown "88 / 8 = 111". I opened a dispute to have a partial refund of ~2USD, but the seller didn't agree and AliEx had to arbitrate in my favor.