I was hearing eggs frying on one channel of my KW500, so it needed fixing. With so many positive reviews, I opted to go for the full Monty upgrade. That was one year ago, and it just seems to go on getting better and better. I mainly listen to classical music, and my Hi-Fi holy grail has been to close my eyes, and imagine that I am in the concert hall, or opera house, listening to a live performance. Before the upgrade, I had the sense of a performance in front of me, but not actually being there. Since the upgrade, I have got inside the venue, and the performance itself has been transformed. The sound stage is huge, with width and depth. Less than stellar recordings have come to life, and the best recordings are overwhelmingly. It’s so like going to a live concert, that I want to applaud at the end!