It's the first time I own a Arcam product. The Avr300 is from ebay as a secondhand unit. I am happy with the sound in stereo as well surround through the avr300. However I have to admit that I got a small problem with the Mute button on the face plate of avr300. I don't know the reason but the Mute button seems get stuck tightly (it doesn't response a tick when you push in it whereas the other buttons do). Consequently, the Arcam itself does the action to go Mute and go back sometimes and when it happens, no buttons on the face plate could be used to operate the avr300. Additional, In my case, I don't have the Arcam remote then all operations I have to go through the buttons on the face plate. So anyone out there could help to fix my problem or a suggestion to repair the Mute button. It's much appreciate.