Resistance of Soldering Rigs

Hi All,

I am interested to know if anyone used a resistance soldering Rigs I
was looking at an American Beauty 250W Unit and a Unit that Stuller
has which is supposed to be 1000W

If you use such a unit, I would like to know:

1) What wattage range do you use?
2) Which manufaturer / model do you use?
3) How do you like it?
4) What limitations have you encountered with it?
5) Have you found it a valuable asset?

Please feel free to email me directly