Before I decided a steel recoil assembly was not needed I did some research on the benefits of them. What I found was to things. First, unless you are using the gun for hours in extreme cold there is no reason to replace the polymer rod. I. Freezing cold for a long time it is possible that the rod will become brittle and snap. Keep in mind it is the spring not the rod that takes the shock of recoil. The rod just keeps the spring in alignment and is under little duress.
The second thing I found was on YouTube. It was a torture test of the Lakeline and Galloway recoil assemblies. The video showed the Gallway spring was slightly unseated after a lot of firing. I have no idea how many rounds were fired. The Lakeline assembly was not affected. what did that prove? Nothing.
Now consider that there YouTube reviews of the G2 and more rounds with the OEM recoil assembly working fine. My SW SD9VE had a plastic recoil rod. I shot at least 5000 rounds through that gun over six years. No problem with the rod or spring. So I am. Sticking with the OEM recoil assembly in my G2C. I prefer to keep my money in my bank account until I have a good reason to spend it.