Over the years that Open Door has been selling his wonderful upgraded DACs, has anyone ever been disappointed...? I’ve had a few of them over the years. Capacitor swopping as Rob made ever better discoveries and learning with him what a huge difference deft and sensitive component changes can make. 6 months ago I finally found something better than my latest DAC from Rob. But it cost 6 times as much. And it wasn’t so very different. I could easily have gone back. So... buy with total confidence. Robert has exceptional ears and skills. Moreover, he’s a thoroughly good bloke.