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I got this on my used 1990 Jackson Rhoads Pro and haven't had any problems with it. For a 22 year old bridge it's holding up VERY well. The knife edges look brand new and there's no rust anywhere, without me just saying it there'd be no way of knowing it's 22 years old. Just like the original these things are great. I can dive bomb, squeal, and flutter and have the bridge come perfectly back in tune every time. The deal with the knife edges is that if they’re softer metal then over time they get worn down from pivoting on them. Once it’s not sharp anymore the bridge can’t return to “zero” thus keeping it in tune. Bending and using the bar makes the guitar go out of tune. Having hardened steel knife edges, like the Original, Schaller, and Gotoh, keep them sharp for much longer. Like this, it’s been 22 years and still sharp. Most licensed ones can go bad even within the first year.
These Schallers are a bit more expensive than the original so that's my only complaint, I'd rather spend less and have the original.
One complaint I've heard is that these are made out of zinc (like cheaper licensed ones) but have hardened steel knife inserts. The problem with them being a softer metal is that when intonating the bridge when you tighten the intonation set screws they can sometimes strip and become useless. No fix for it and AFAIK the only option is a new bridge. Schaller has since fixed the problem with inserts for each screw but on older ones it was a problem. Again I haven't witnessed this so I can't comment. Most Schaller floyd roses don’t say Schaller on them, they’re normally licensed from a guitar company such as Washburn, Jackson, Gibson… and has their name imprinted on the bridge instead. They are still the same bridge, just with a different name.