I looked at K systems when I was shopping around for my system, along with pure freedom, Ionics, Pure2o, brodex and a few others.
My impression was that they were cheap, and pretty nasty.
The email I got from the bloke did not inspire much confidence, and then a little later I saw this thread.
http://www.cleanitup.co.uk/smf/index.php?topic=166676.0Bad report after bad report. That made me steer well clear.
(Someone said:
"he has now decided to pursue a course in his personal life, that does not lend itself to running a successfully business. IMO. "
What did that mean??? Drugs? Criminality? Who knows!)
I went for Pure2o (cheaper brand of ionics), and highly recommend.