I agree 100% with NeilBall. Knekt's been around a while and is a bit long in the tooth, it's not the fastest system around and it's certainly not the most flexible/compatible in terms of the range of stuff you can use with it. It does offer local amplification though which better than having a big central power amp from a sound quality point of view and you can also upgrade by adding power amps to the system and even going active with the in-wall/ceiling speakers. Having local source inputs is also a bonus if you want to hook up the TV sound or have a local system in any room.
As Neil says though, things have moved on and there is new technology out there that is much nicer to use and has way more functionality. Linn are also looking more to the future now, and have released two new servers to replace the Kivor - The Klimax DS (staggering by all accounts) and the Akurate DS neither of which have any storage! I've not seen one in the flesh (yet) but if the recent CD players are anything to go buy - will sound fantastic!
I've also caught the NetStreams bug too and have a digilinx demo kit - I'm eagerly awaiting the NaimNet products before refitting my place. Things do seem to me moving down the IP route of distribution.