I used these flexible rods. They were fine for a couple of weeks, then one evening it was cold and the rod shrunk so much I didn't have enough radio trim to fix the problem. I have removed all nylon rods from all my planes.

That being said, some people like them, and it is not a bad idea for you to try them and find out for yourself. As mentioned above, the more places you anchor the outer tube, the less flex you will have inside the plane resulting in greater precision.