How successful are cochlear?

Could you elaborate on the phrase "How successful are cochlear?" as it seems incomplete or misphrased? However, if we assume you're referring to the success of cochlear implants, here's a simulated question with the tone of a curious inquirer: "I've heard about the remarkable advancements in cochlear implants, but I'm curious about their overall success rate. How effective are cochlear implants in restoring hearing to those with severe to profound hearing loss? What kind of improvement can individuals expect in their daily lives after receiving a cochlear implant, and what factors contribute to a successful outcome?