Got one myself... works GREAT!
Same Rockwell hardness on the knife edges as OFR but zinc saddles & a small block reduce cost. As all OFR parts fit I might at some point simply replace that block with a big brass or steel.
One problem.. the arms on them don't stay too tight, they go back to swinging easily even if you really choke the thread on the nut. It's slightly annoying but the trem itself is great.
