lots of tiny blobs of solder fell out. the potentiometer is very harsh. power supply is GLUED to the bottom panel with lots of silicone and white pcb glue. larger heatsink is not soldered or mounted well to the board. it can be moved around so the only thing holding it in are the three legs. one of the tips fell apart when it was heated up 10-15 minutes the end fell off. tips look VERY cheap. some settings i do not see in the menu. the power supply is 3.4 amps it says this on the board. the housing is in good shape and the front panel was also in good shape. im very surprised at how much glue they used to glue in the power supply pcb its CAKED everywhere good luck if you ever have to replace it. also beeps constantly as you turn the knob. my other one of these SAME UNITS from another seller the psu board is not glued in and fits perfectly. why is this one glued down like this? i bought this one to give to someone but i dont know if i will now. also this is stc based not stm