Bought to replace Xytronics 379C which finally gave up after 14 years of reliable service. I had a few tips for the 379C, so I was happy that this unit can use all of the tips. The digital display is a nice upgrade and controls temperatures just as well, if not better, than the 379C. I've been testing it myself for the last 4 days 8 hours a day and so far so good.