My Nordhavn came with one, as do most if not all Nordhavns. I'm no expert, but it seems good. I do know one sister-boat who had a singing sound coming from his prop at certain RPMs. Ultimately they replaced the prop and problem solved.
They are either China or Taiwan made. Supposed to be metal wise of good quality, just not sure of the casting machining quality. Were supposed to be what most Taiwan trawlers were shipped with to the USA.