They are good! Although my wife manages to kill hers every few years, I don't think I've ever actually had one die myself. I also have my original UV sanitizing charger unit that I purchased new circa 2009!

I've found that one can buy just new handles on ebay though, without the head and chargers, for only like half the super high retail prices or less, even for the "higher end" models, so I do that every 5-8 years or so if one gets too bad.