Bumping this thread to report my findings...
I'm a huge fan of Floyd Rose systems, but I've recently aquired a Kahler 2315 equipped ESP VN STD.
the guitar (and trem) is three years old and in perfect condition, the trem is set up perfectly, all the moving parts are moving freely, I've soldered the windings etc....
But I've also experienced the string-bend issue, you can dive and pull like crazy and the trem is as stable as a FR, but bending the strings knocked it out of tune....a wee dive after the bend took care of the problem...but I don't wanna have to dive all the time just so I can bend a string and then keep playing after that.
So I began to become really frustrated with the guitar....
Reading around on the web revealed that apparently the springs should be replaced every couple of years....so I thought I'd try and replace the springs, I bought new HEAVY TENSION springs from Kahlerparts.com and replaced the old springs with the new heavy ones today...
and know what?
all the issues are solved now...the Kahler holds tune PERFECTLY with dives, pulls as well as bendings, I can abuse it like crazy and don't have any tuning issues...just like a good Floyd Rose!
yes, the bending thing shown in the above video seems to be a common issue and you can find reports of that problem all over the net...most of it just people repeating what other people said though.
my first experiences where paralleling the findings in the video, so I believed it was true....simply changing the springs fixed that problem.
the Kahler is as stable as the FR, also for bends
here's proof
[ame]http://www.youtube.com/watch?v=jSRLd9Z0nbw&feature=player_embedded[/ame]