I had posterior cervical neck fusion C3-7 last May. At my one year follow up, there were no hardware failures and the fusion has been good. Yes the surgery healing was very painful but it was well worth it. I do not have much movement limitation with the hardware. The rods are necessary to stabilize the neck and hopefully prevent other deterioration.
The most important thing is to find a good neurosurgeon!
I hope things work out for you.