I echo Dizz's comments and would add the following:
One of my businesses is an A/V company that is authorized for K, Axonix, and Xperinet. We now only sell and install K systems. We have replaced two Axonix systems and one Xperinet system with K as well.
Reliability:
It is not my intent to trash the other systems, they do work, and I imagine the problem rate is typical of those types of systems. The problem is, our clients DEMAND simple trouble free operation and at this point, only the K system has shown the reliability required to service our clients at that level (not to mention it has absolutely the best GUI).
Service:
How about a client away from home for several days that comes back to find a drive has failed (email from K to the dealer as well), he calls the dealer to report the issue and while the dealer is on the phone explaining the process, FedEx shows up with a new drive. It had been shipped immediately after the problem was identified by K. (That's the only drive failure we have seen, and the need for that type of speedy replacement has been mitigated by the introduction of the 3U Server with it's hot swap backup drive.)
Functionality:
We have found that on average the K loads movies and CD's faster than Axonix (have not compared the Xperinet).
K's GUI is so user friendly and reliable that I've seen a 4 year old work the system without assistance (and K's parental controls are excellent).
I'm not saying that K is perfect, it isn't (we always want more
), but based on our experience with their systems, we will continue to sell only K.
I should also disclose that I have a K system in my home as well, so I've become somewhat biased in K's favor over the years.
Jim