Ok, I've worked with metals for years. Titanium gives a better strength to weight ratio then steel... BUT a pound of steel is MUCH stronger then a pound of titanium. Unless those titanium ones are BIGGER, they wont provide any benefit over a GOOD steel floyd rose.The ONLY thing I could think of, is it MAY provide a "brighter" tone. Still, for 800 dollars, theres no way its worth it unless you have XXX,XXX,XXX.XX$ in your bank account!
The brass blocks on the other hand make sense to me. More mass = more sustain. More resonance, and I cant think of a downside to having a brass block other then it being weaker. But its not a wear part, so it shouldnt matter. A "steel" block would be heavier and have even more benefit, but it would corrode, and chrome plating or stainless block would costly.
For reference on what im talking about,
tool steel has tensile strength of around 5000 mpa, titanium has strength of around 1000... Tool grade steel is almost 5 times stronger. Again, its MUCH heavier, but its a floyd rose.... its not really that heavy to begin with. Another "benefit" of the titanium one though, would be zero corrosion ever. It should, theoretically, literally last forever.
Now a graphite floyd rose on the other hand....
edit: now THIS is EXTREMELY cool!!
http://www.floydupgrades.com/catalog/in ... cts_id=196
edit 2: Now this is complete garbage. 19$ for what's effectively steel wool? No thanks.
http://www.floydupgrades.com/catalog/in ... cts_id=223