I am using a clone I bought some years ago. It has been working reliably for me. The ony advice I have is: Only use it on a power outlet that is protected by an RCD/GFI. Two reasons for this:
a) The ground wiring in the wand/hand piece looks thinner than it should be, I am not sure if I would like to rely on that to trip a 16 amp. breaker (which will sustain 30 amps for a long time and only trigger the rapid trip mechanism at 80 amps).
b) The power switch (at least in my unit) is single pole. Unless you have polarized power plugs (and the wiring in the unit is correct), a short circuit to ground in the heater could deliver full power to the heater even when the power switch is off, creating a fire hazard (mine does not seem to have a thermal fuse, some newer ones have a thermal fuse, but I would not rely on that without opening it and checking).