My first ones I bought back in July ‘17.. No issues so far. I’m converting the t12s to t8s and getting away from have two ballast per fixture.. - Edit I had to replace one of theses ballast. It was one of the second batch of ballast. The ballast wouldn’t light any of the 4 t8s in the fixture. Checked voltage to ballast 120v. Put in a new ballast one and all four lamps lit. I’m thinking I should date some of the ones I’ve put in recently. I’ll follow up later with any news.