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(-) I found a thin, floating cooper wire inside, approx 8mm in length (please check my pics). This may cause short-circuit at any time. PCB a bit dirty. Soldering iron is larger than expected. (+) Good design and temperature control. Reliable ac wire connection joint. I would say this is a great product, especially for the price. However you need to disassemble it ,check the PCB and cut the floating wire, if any. Otherwise it may catch short circuit at any point of time.
I recently purchased the product if I have to give an evaluation I would say, level of plastic as coating not from a good impression I value to the welder, the cover plastics I see a little too poor, you could use a much more comfortable and ergonomic coating, otherwise how working seems to work well the display that indicates the temperature you are using and a convenience.