Cochlear Implants & Possible Complications?

I was born "hearing impaired"; I function with about 50% of a "normal person's" hearing, maybe a bit less. I wore an external hearing aid in my right ear for a time and found I disliked the inconvienience (and the fact it was external) and thought there wasn't much difference in my ability to hear, though my family thought otherwise. They're now asking me to consider cochlear implants. First of all, would I even be eligible? I've gotten both "yes" and "no". I thought cochlear implants were for those with overall profound loss of hearing; only my right ear's profoundly impaired; my left is only moderate to severe. Second, I've heard that cochlear implants sound very mechanical and "robot-like" to people who have lived most of their life without them. I don't necessarily want that, as I already have pretty decent English skills and I'm in the process of learning foreign languages. However, I've heard that it helps daily functioning and improves quality of life for those who can get used to the mechanical sound. Anyone who has cochlear implants implanted post-lingually and any thoughts?