Good feedback, thank youThe plastic orifices are fine. I find that I cannot set them to the finest edge like I can a good brass or steel or gold orifice but they hold tune much longer because they do not cut the seat. All in all, I am going to say they are an improvement. I have had no problems with durability.
I am going out on a limb a little bit here but I might say the plastic orifice negates the need for a seat saver function.