OIC! I've been using them for a short while, as my supplier stopped stocking the 'Best' 0.1db's. I've had more failures of Invertos in six months than I had with the cheaper Bests in 6 years (3 failures in almost 2000 installed!) ! Having said that, the Invertos are good if you get a good one, I'm just a bit skeptical of their quality control.