It's been my experience that kahler haters are those who have never played one, or have not had one set up properly.
I often get people asking for a floyd or a hipshot or some bridge other than a Kahler. Most often these are people who have never owner a Kahlered guitar.
This is why I install Kahlers on my builds:
Benefits:
Its both a trem or a hardtail. I play mine as a fixed bridge, there is a small grub screw in the back that locks in, if its in, its a fixed bridge and it cannot move, if its out, its full trem like a floyd.
More adjustability than most bridges. You can adjust string spacing left and right. Great for getting the guitar to feel right for your playing personality. Can adjust individual string heights as well as the usual intonation forward and backward. There are aftermarket springs to adjust tension, or different saddles etc can be experimented with. Ie: upgrades are available.
As a fixed bridge - it recieves all the benefits of fine tuners and lock nut that is missing from all fixed bridges.
As a tremolo -
It has a cam rather than blades like a floyd has, so if you dive, the cam rotates wheres a floyd can jump, screwing up your tuning etc.
It has individual rollers on each saddle, so the rollers move with the string rather than a fixed saddle which doesn't. On a kahler if the string moves the roller helps it to seat back in the exact same spot not effecting your tuning
On the 7 string bridges, the upper strings have larger saddles to allow for the trend of massive string guages.
Kahler route Vs floyd route - the kahler has a shallow, top only route. The floyd is routed through the entire guitar and then a massive cavity on the rear of the guitar as well. People crap on about "tonewood" - most tremolo's reguire you remove half of it. Not the kahler. Neat and tidy.
CONS: The kahler locknuts are crap, that's why I use floyd locknuts with the kahler bridge.
Sure they're a little chunky than some of the "petite" bridges on the market, but you very quickly get used to that and the fact they're a sure solid bridge thats been on the market since the 80's and has benefitted from decades of improvement.