I have purchased 2 Nibbi carbs recently and overall I'm impressed with the build quality and price.
However, we have had some issues, the first carb needed the mixture screw adjusting as it was turned right in and the second carb wouldn't run until we changed the faulty pilot jet.
That said, overall the carbs are now our go to for our bike builds as they perform well and as stated before the price point and overall quality is really good.