I'm using the LCTHC from http://www.candcnc.com. It works great. Hookup was fairly easy into the PP-50. It was just a little time consuming. Something else I'd like to add is a height senser so it will zero out before every pierce. The reason being is this. If i stick a piece of 4'x4'x1/4" plate on the table to be cut, it's not going to be perfectly flat and level. There will naturally be a bow in the material. So if I zero the Z axis at the bottom left of the plate and start piercing at .15 above the material, by the time I get to the center of the plate (at the bow) my torch is touching the plate when I pierce than the THC will take over and move to .06" or so above the material (or whatever you have the volts set at). That usually screws up my tip my blowing molten metal back into the nozzle and causes it to cut with a bevel. Right now when I cut from a 4x4 sheet, every so often I'll hit the FeedHold button and zero the z axis and keep cutting.