I have had the same Tenma soldering station for about five years now. However, I only had about 6 or 8 hours of use and the cartridge in the pen failed. Not a good deal as the pen is short lived and as another commenter said the nibs get stuck in the pen. I hope this replacement soldering iron will last longer. Had to buy a soldering iron or throw away the $100 soldering station. My next stop will be Weller.