Looking at picking up a Lincoln Invertec STT for a good price. I have had experience with the STT II but not the earlier model which I would be purchasing. Any reason I should avoid the earlier model? ThanksMiller Dynasty 280 DXMiller XMT 350Miller Xtreme 12VSMiller 22a CVMiller Multimatic 200Hobart Trek 180Esab MM 250Esab MM 251Lincoln 256Lincoln Invertec 275Hypertherm PM 45Hypertherm PM 65