I bought the Gotoh GE1996T-36-G, to replace a Jackson licensed Floyd Rose with zinc block. The Japanese construction is solid, with hardened steel saddles and, most importantly, a brass sustain block.
Swapping the zinc block for brass makes a clear difference:
More sustain, more defined bass, the guitar gains body and presence, a firmer response when playing.
It has excellent tuning stability. The guitar comes alive — more sustain, more body, and a more "premium" overall response.
The only thing I didn't risk was changing the original posts; it would require a more extensive modification. The original posts are working perfectly, for now.