Summary: Reading Lawrence's review below, he seems to have been very unlucky. Mind you, I have contacted Krell a couple of times and also received no reply, so I'd agree with that bit. Downsides of the Krell s-300i - getting it home (heavy!), the remote eats batteries quite fast and your choice of inputs and outputs is a little limited. It also runs warm, so heed the instructions about leaving space all round the amp.
Summary: Just bought this 2nd hand. Its worth every cent. Unbelievable control and grip over my sonus faber grand piano domus speakers. I used to have a KAV-300i and this was an upgrade and a worthwile one. The difference between the 2 is that the S-300i has got better sound stage and presents more depth of detail. It presents all the individual components without losing the plot.