I bought the 55 amp model many years ago due to the good reputation. He served about 6 years and then died. I bought a replacement in mid 2017 and it is now not working in mid 2019. I think the capacitors have already dried up in just two years. I'm now considering my future choices as these power supplies should last around 5-7 years if kept relatively cool. Mine used only 15 amperes and died after two years! I think Yota switched to cheaper capacitors at some point.