Re: Kahler vs Floyd
I like both. I have nothing that big against Floyds, but to me, the Kahler is superior in almost every respect. I never cared much about either for a long time. However, I got my first Kahlerized guitar some time last year, and since then, I've been hooked on them. They're everything I've always wanted in a vibrato. They look good. They perform great. They're easy to install. They're almost infinitely adjustable. They require routing, but to my mind, it's in a less offensive way than a Floyd.
The main functional difference is that the Floyd is basically a souped-up Strat vibrato: fulcrum style, through the body with body-mounted springs and claw – and it's double locking (saddle and nut). The Kahler is basically a souped-up cross between a Mustang and a Bigsby vibrato: cam style, and self contained (one unit that mounts on top, to which the springs are internally attached) – and it's single locking (nut only).
A Floyd is a bit harder to set up. You need shims in order to adjust the heights of individual strings. The Kahler saddles adjust pretty much like a Strat. String spacing is also highly adjustable on the Kahler.
It's also easier to restring a Kahler. No string cutting necessary...though bullet-end (Fender) strings work better than ball-end strings (same goes for a stock Fender vibrato, BTW).
The Floyd stays in tune a little better when doing super extreme vibrato "tricks." That's because it's double locking. It also feels more like a traditional Strat vibrato. The Kahler has a tighter and more controlled feel, and IMO is better for "traditional" vibrato use (but can also do its fair share of "tricks.") For what I play, the Floyd offers no advantages in these areas. I use my vibratos for actual vibrato (going slightly up and then back to pitch over and over), and as string benders (usually up a step, like a B bender). If I was a hot-dog showoff vibrato wanker monkey, I might find some advantages to the Floyd.
A bit of trivia is that the forward rim of the Kahlers are designed to fit perfectly into the vibrato cutout of a Stratocaster's pickguard. Also, about half of the required routing is already done on a Strat. So they are right at home on Strats.
Another point is that Kahlers should have routine maintenance performed on them. They should be cleaned and lightly oiled several times per year. (Its easy work, though.) Floyds, OTOH, being fulcrum-based vibratos, don't really need routine maintenance as much.