Metcal is supposed to be one of the best stations, but I have never used it. This particular model is only 35 watts. The tip determines the temperature, so if you get it, make sure you have a series 600 or 650 tip. Don't use anything too hot or you're likely to heat and lift the contact pads off the PCB.
My old Weller WTCPT had the same type of mechanism where the type of tip determined the temperature. It could very well be that I was using a low temp tip (this was many many years ago). However, I'm totally spoiled with my Hakko - so I may be jaded. It could very well be that the Metcal or Weller may work out okay. If it was between the Metcal and Weller, I would probably jump on the Weller because of power output and temp controllability.
Used is not bad, as long as the item was kept in good condition. I bought a used Hakko 470B desoldering stations years ago and it's still going strong.